Tutorials Posted by bkalafut
bkalafut from University of Arizona
bkalafut's Posted Tutorials
| Bounty | Category | Question | Tutorial | Purchases | Date Posted |
|---|---|---|---|---|---|
| $3.00 | Mathematics | I am needing help with my math DQ's FOr | Please put this in your own words:
... of integers, which is to say that a/b is from the set of rational numbers. It can be shown that taking x^(a/b) is the same as multiplying x times itself a times, then taking the bth root of the...... | May 02, 2013 at 8:51:45PM | |
| $0.50 | Mathematics | algebra | Order of Operations walkthrough
...arentheses E=exponentiation M=multiplication D=division A=addition S=subtract... | Apr. 26, 2013 at 11:20:32AM | |
| $1.00 | Physics | The color least likely to appear in a so | Why red is the color least likely to appear in a soap bubble.
...rence. If we're considering first-order interference (from waves that reflect only once): The wave bouncing off the outer surface gets a 180 degree phase shift, meaning the wave bouncing off of the...... | Apr 09, 2013 at 11:17:55PM | |
| $4.00 | Mathematics | Describe how to find the common denomina | Common denominator of rational expressions, with shared factor
...rational expression is x/(a*b) and that the second is y/(a*c). where x and y are arbitrary polynomials. The difference of these is x/(a*b)-y/(a*c) To illustrate something for you, note that these...... | Feb 01, 2013 at 5:38:08PM | |
| $1.25 | Physics | Science -Psychics. Velocity question | This is a "conservation of momentum" question.
...l 0=weight_boy *v_boy + weight_girl * v_girl The "v" quantites--velocity--are vectors in principle, and would need to be treated component by component, but there's only one relevant component here,...... | Feb. 01, 2013 at 09:44:59AM | |
| $1.00 | Physics | PHYSICS QUESTION | Explanation/walkthrough from a former physics instructor, starting from F=ma
...an often be modeled as a constant * the magnitude of the normal component of the contact force (sometimes just called the "normal force"). Here the normal force must be equal to the weight of the...... | Jan 25, 2013 at 10:50:00PM | |
| $2.00 | Engineering | Angular velocity | One revolution is 2*pi radians of angle: a and b are unit conversion, as I explain...
...evolution. The "frequency" is the number of revolutions per second. 3 radians /sec * 1/(2π) revolutions/radian = 3/(2π) revolutions / sec. That's your frequency. The period is the time per...... | Jan 24, 2013 at 3:35:40PM | |
| $1.00 | Biology | microbiology | Four sterilization techniques from my professional experience
...claving. That's a technical word for exposure to steam at high pressure. Items to be autoclaved (glassware, surgical instruments, syringes, etc.) are placed in a unit that is in essence a highly...... | Jan 23, 2013 at 5:26:39PM | |
| $0.50 | Mathematics | Divide and write the answer as a complex number in standard form | The trick to dividing complex numbers, with explanation.
...ly it out. 2i/(6-5i) *(6 5i)/(6 5i) = 2i * (6 5i) / ( (6-5i) * (6 5i) ) Note that the "bottom" (denominator) will be a real number, 36 25 = 61. The "top" (numer... | Jan 18, 2013 at 10:06:56PM | |
| $1.00 | Engineering | Tension in two ropes ..answers & calculation required | A tutorial: full setup, no cheating. (From a former physics instructor...)
...hese problems is to realize that "in equilibrium" means "not accelerating", which from Newton's Second Law ( vector F = m * vector a) means the vector sum of all forces is zero. We have to deal with...... | Jan 17, 2013 at 4:58:50PM | |
| $1.30 | Mathematics | A cold soda had the initial temp. of... | Its an exponential decay (so skip the other answer, which I checked.)
... /minute Now substitute this into the original formula to get the difference after twelve minutes. Delta T= -57 degrees * exp (-0.02183805373 /minute * 12 minutes) = - 43.8596 degrees The drink after...... | Nov 25, 2012 at 6:30:48PM | |
| $1.00 | Mathematics | Statistics | What E(Y) is here.
...eraging the results of many trials. Here Y ca... | May 26, 2012 at 5:35:55PM | |
| $4.95 | Mathematics | Statistics | Explanations and more, from a PhD with probability and stats experience
...ugh 5 are equally likely. (b) Each week is a Bernoulli trial with very low probability of success. It follows that this is binomial. It is approximately Poisson since n is high. (c) This is...... | May 26, 2012 at 5:32:11PM | |
| $0.75 | Mathematics | inequality | Inequalities.
..., and 10^12 (one trillion) are all greater than 3, so... | May 21, 2012 at 5:33:42PM | |
| $5.00 | Mathematics | Statistics | Thinking of binomial probabilities: this butterfly example
...ase the number of butterflies) is 9. (The formula for the probability function is (n choose k) * p k * q n-k ) (a) We're asked here what the probability is that exactly four are alive. This...... | May 21, 2012 at 5:30:22PM | |
| $1.00 | Mathematics | Statistics Question | A quick explanation: what the confidence interval means, using this as an example.
...meters), a confidence interval of size A (e.g. an A=95%=0.95 confidence interval) contains the "true" population parameter (when such a thing can be said to exist) with ... | May 18, 2012 at 3:28:22PM | |
| $2.00 | Business | Please help me with this assignment. Thanks | What to do to test equivalence of distributions
...e can't do a 2-sided T-test or the nonparametric equivalent, the Mann-Whitney U. What you would need to do a 2-sample is a test for equivalent distributions The two most common are the Kolmogorov-Sm...... | Nov 29, 2011 at 4:57:56PM | |
| $1.00 | Mathematics | Science help asap! | Thats a great question--heres a treatment to get you started.
...much like lithium, magnesium, which is somewhat similar to beryllium, aluminum, not like boron too much but close enough in some ways, silicon, which is very much like carbon, phosphorus, which is...... | Nov 27, 2011 at 11:29:44PM | |
| $1.00 | Mathematics | Plane seats | Quick walkthrough: how to translate this into equations and solve it
...te the total number of passengers as t: m+w+b+g=t and the number of seats as s. Our strategy will be to find t, and then find s, since s is only related in the probem directly to t and not to m,w,b...... | Nov 27, 2011 at 11:11:26PM | |
| $1.50 | Physics | need help with engineering physic | A walkthrough of tis Coulombs Law problem (from a physics instructor)
... this charge at (1,0) cm will point to the left (negative x direction) and will have magnitude 1/(4πε ) 7µC /(3 cm)² since the point of interest is 3 cm away. From the 6 µC charge at (-4,0) cm...... | Sep 03, 2011 at 5:05:32PM | |
| $2.50 | Business | 1. Does a tennis court provided by a lo | On public goods: remarks about both questions that should get you started.
...val and non-excludable. One may presume that the court satisfies this second criterion, that it is non-excludable as a matter of policy (although it is possible to keep certain people out, most park...... | Sep. 03, 2011 at 06:49:36AM | |
| $5.00 | Mathematics | Stats Discussion Question! | Correlation and causation discussion...
...-paste purchased tutorials. (a) One can never conclude causation from correlation alone. That data vectors x and y are correlated is symmetr... | Jun 22, 2011 at 7:06:37PM | |
| $1.50 | Biology | Match the tissue type to its function.A | Tissues and functions with explanation
...lial cells are tightly packed so as to form barriers. C. Nervous Cells may possess very long transmission fibers Nerve axons can be almost meter-long. D. Muscular Cells contain interdigitating...... | Jun. 21, 2011 at 01:48:34AM | |
| $1.50 | Chemistry | Effects of Changing Concentration | What the voltage and amperage depend on, and why.
...al energy for moving a coulomb (SI unit) of charge from one place to another. In an electrochemical cell this corresponds to the energy in the number of redox reactions that would be enabled by...... | Jun. 18, 2011 at 02:06:11AM | |
| $1.00 | History | Who wrote the Declaration of Independenc | The authors. Note the plural.
...ure, but he did not write it himself ab initio. The Continental Congress tasked a five-member committee with drafting the declaration... | May 23, 2011 at 10:13:45PM | |
| $1.00 | Physics | Two identical concave mirrors are set fa | This is a slightly modified form of a very familiar system. 4f with mirrors:
...plane 1 focal length to the right of the second lens. What you have here is the 4f system, but with mirrors. Light travels... | Apr 24, 2011 at 7:06:21PM | |
| $10.00 | Mathematics | Non-parametric Statistic proofs | #3: Equivalence of two forms of Kruskal-Wallis statistic
...conflicting about the simplified form of the Kruskal Wallis statistic.... | Apr. 13, 2011 at 05:41:57AM | |
| $10.00 | Mathematics | Non-parametric Statistic proofs | #2: Equivalence of Wilcoxon W and Mann-Whitney U test statistics
...ummarize it: we look for a way... | Apr. 13, 2011 at 05:03:42AM | |
| $1.00 | Biology | Can you physically touch a chromosome? | Yes: read on.
.... For starters, see the 1997 Science article of R Bruce Nicklas, one of the pioneers of the technique, "How ... | Apr 07, 2011 at 4:22:34PM | |
| $4.00 | Mathematics | Algebra Word Problem, please help me understand the steps | Walkthrough of all except graph
...ot the function yourself on grid paper or using computer software. (Excel is junk, but it will work.) (a) The number 5 is a horizontal shift. It moves the graph to the ri... | Apr 06, 2011 at 1:39:49PM | |
| $1.00 | Physics | What is the latest theory for the cause | The latest foundational/fundamental theory of gravity: an entropic force.
...rmal fluctuations. The connection actually dates back a couple of decades but in its modern form--incorporating the "holographic principle"--it originat... | Apr. 04, 2011 at 12:48:46AM | |
| $10.00 | Physics | Physics question | Two ideas/examples for you. (From a physics instructor.)
... follows from Newton's second and third laws. After the ball leaves the bat there are two forces at work. One is gravity, approximately constant downwards toward the center of the earth. The other...... | Apr. 01, 2011 at 04:12:03AM | |
| $5.00 | Mathematics | Random variates with distribution X | Inverse transform sampling, given and qualitatively explained and proved.
...iables with a certain distribution given that the (cumulative) distribution function is invertible. It's called "Inverse transform sampling" and is often not the (computationally) best choice but it...... | Mar. 25, 2011 at 04:26:52AM | |
| $1.00 | Mathematics | old man trying to help granddughter | Step-by-step
...7y*7y Note that the "mixed" terms cancel So you're ... | Mar 18, 2011 at 7:21:27PM | |
| $1.50 | Mathematics | A survey team is trying to estimate the height of a mountain above a level... | How to get rid of that unknown distance and find the height.
...and we have h/(x - 1500 feet)= tan (33 degrees). Two equations in two unknowns. Solve the first one for x, obtaining x=h/tan(29 degrees) Now substit... | Mar 03, 2011 at 11:32:31PM | |
| $1.00 | Mathematics | A point is rotating about the circle of radius 1 in the counterclockwise... | No calculus required, just understand the rate--see below
...tion in 8.4 minutes, so in 2.7 minutes it has completed 2.7 minutes * (1 revolution / 8.4 minutes)=0.321 revolutions. Since there are 2π radians per revolution, this corresponds to having ...... | Mar 03, 2011 at 11:22:32PM | |
| $1.00 | Mathematics | (1 pt) A point is rotating about the circle of radius 1 in the counterclockwise... | No calculus required.
...espect to the x axis. So if the point started on the x axis its x coordinate is cos(2.02 radians)=-0.43 and its y coordinate is sin(2.02 radians)=0.90. If the point started on the positive y axis,...... | Mar 03, 2011 at 11:18:00PM | |
| $1.00 | Mathematics | How do I solve?2x+x^1/2-3=0 | This one is quadraitic in the square root of x.
... the quadraitic formula √x=(-1±√(1+24))/4 √x=(-1±5)/4 √x=1 or √x=-3/2 which implies x=1 ... | Feb 28, 2011 at 11:03:30PM | |
| $1.00 | Mathematics | How do I solve?x⁴-6x²+5=0 | Note that this is a quadraitic equation in x^2
...uadraitic equation in x². So use the quadraitic formula to solve... | Feb 28, 2011 at 10:54:31PM | |
| $1.00 | Physics | Physics | Arm as lever and mechanical advantage of bicep
...p=l_bicep/l_hand=1/6. The mechanical advantage of the bicep in this case (bicep attached 2 in from... | Feb 28, 2011 at 5:15:47PM | |
| $2.50 | Mathematics | What is the probability of selling your | Understanding the median
...rue of real "discrete" probability distributions. Prices are technically discrete if we round to the neares cent, but again, so fine that they are approximately continuous. Even so, saying that...... | Feb. 24, 2011 at 04:58:11AM | |
| $25.00 | Mathematics | Markov Chain | Full walkthrough of a-e, setup plus partial solution of f and g
...sure to check all arithmet... | Feb. 24, 2011 at 04:43:39AM | |
| $1.00 | Mathematics | Explain what is wrong and why it is wron | These 6 misconceptions addressed
...t B will win even if nothing changes. 4. There are bell-shaped distributions that are non-normal (non-Gaussian), some of which have thicker tails. The Lorentzian or Cauchy distribution is the most...... | Feb 18, 2011 at 6:20:16PM | |
| $1.00 | Mathematics | Algebra word problem help! | Just subsitite for t
...e A good calculator will evaluate 1.4^4 for you... | Feb 13, 2011 at 9:43:11PM | |
| $1.00 | Mathematics | Suppose you throw three darts at the tar | Counting this up in an orderly way.
...100 1 50 1 10 160 points 1 100 0 50 2 10 120 points 0 100 3 50 0 10 150 points 0 100 2 50 1 10 110 points 0 100... | Feb 13, 2011 at 8:12:19PM | |
| $1.50 | Mathematics | mathc | Why use a Riemann sum?
...the sort that has no more convenient method of computation than numerical integration. Another is when the antiderivative is only known in certain "neighborhoods". Yet another is when the function...... | Feb 13, 2011 at 7:49:58PM | |
| $1.00 | Physics | physics discussion question 5 | Why no binaural sound localization under water
...smaller--sometimes too small to process and so different than in air that whatever localization is done is both false and not self-consistent across frequencies. Add to this the counfounding effects...... | Feb 11, 2011 at 12:08:27PM | |
| $2.00 | Physics | Physics - Two blocks & pulley - find acceleration | Were going to assume that the hanging block is to the right...
...orizontal surface. For the system moving right, Newton's 2nd law for both blocks m1 * a = T-μk*m1*g (sum of forces: tension right and friction left) m2*a=m2*g-T (sum of forces: weight down and...... | Feb 08, 2011 at 9:22:08PM | |
| $1.00 | Mathematics | Logarithm | Logarithms of products...lets have a look at this
...og 5 - 4 log 9) Now remember the rule for multiplication: log (x^y)= ... | Jan. 27, 2011 at 01:32:10AM | |
| $5.00 | Physics | physics discussion question | Astronaut cooling by sublimation.
...may be necessary. (b) The ice layer must be kept thin, and body/instrument heat must be transferred to this thin layer effectively. This is a design limitation. The rate of cooling is limited by...... | Jan. 27, 2011 at 12:07:32AM | |
| $2.00 | Mathematics | Immediate 6th grade Homework help please!!!!! | Aspect ratio is:
...t 24 and 16 are both divisible by 8 so we divide both sides by 8 (which kee... | Jan 25, 2011 at 5:51:22PM | |
| $8.00 | Mathematics | Probability & Statistic Questions | Responses with explanation.
...between any two points. Specifically, a linear scaling (translation and stretch) does this. So if L(X) is the mapping of point X under the linear scaling, the probability between X and Y is the...... | Jan 24, 2011 at 11:50:05PM | |
| $5.00 | Mathematics | experiment a failure? | Yes, you can get information from that--some of the best historical experiments fit this description.
... things they were to test is whether or not wave speed depends on frequency. They attained a null result: the Spearman correlation test showed no dependence. This means that there is no dispersion...... | Jan 24, 2011 at 6:17:39PM | |
| $1,000,000.00 | English | daddy would you like some sausage | The million-dollar question.
...'ll have to... | Jan. 24, 2011 at 05:41:52AM | |
| $12.50 | Physics | Questions attached re: radioactivity | E=mc^2 and all that: see attachment for solutions.
...3) E=mc^2 to associate mass and energy. #3 I set up but didn't do the co... | Jan. 24, 2011 at 05:37:00AM | |
| $0.25 | Mathematics | Simplify | step by step simplification
...4x^2 - 5x +5x^2 + x + 3 + 5x^2 + x + 3 Now group terms of ... | Jan 22, 2011 at 10:30:04PM | |
| $15.00 | Physics | Questions attached re: quantum physics | De Broglie wavelength, Compton formula, and other turn-of-the-century stuff.
...mechanics. (a) The wavelength of the back-scattered x-rays is given by the Compton formula with the angle set to 180 degrees, meaning that (new wavelength) –... | Jan 22, 2011 at 9:41:45PM | |
| $15.00 | Physics | Questions attached re: theories of relativity | A lot of manipulation of turn-of-the-20th C formulas. See attached. I pasted one response as a preview.
...k-scattered x-rays is given by the Compton formula with the angle set to 180 degrees, meaning that (new wavelength) – (old wavelength)=2* h/(m_e * c). We thus h... | Jan 22, 2011 at 9:39:54PM | |
| $1.00 | Physics | the name for the absolute value of the velocity of an object that does not... | Absolute value of velocity:
...on. The magnitude of the velocity... | Jan 22, 2011 at 8:54:26PM | |
| $1.40 | Mathematics | let p, q, and r be the following stateme | Missing something, but I think I saw this in another students query.
...that you have to translate p ^ ~q --> r -- I saw this as part of a different student's query... | Jan. 21, 2011 at 01:29:08AM | |
| $3.00 | Mathematics | construct a truth table for q squggl | Truth tables
...s operating on is true. So we get true whenever q is true and whenever p is false (not p is true) construct a truth table for (squi... | Jan. 21, 2011 at 01:25:44AM | |
| $4.00 | Mathematics | If other factors are held constant, how does increasing the sample variance... | Explanation
...t statistics. Note that the critical value of t goes *up* as our significance level decreases (or, alternately, as the confidence level goes up). Thus anything that lowers absolute value of t...... | Jan 19, 2011 at 9:39:50PM | |
| $3.00 | Mathematics | A water tank has a square base with each side of length 4 meters. Water enters... | A full walkthrough.
...dV/dt dt = ∫ 20-t dt V(t) = 20t - ½t² C where C is a constant of integration The initial volume at t=0 is 4*4*2=32 cubic meters, which is 32000 liters V(t) = 20t - ½t² 32000 (u... | Jan. 19, 2011 at 03:32:45AM | |
| $2.00 | Mathematics | I have tried to do these questions and c | A walkthrough of both
... T T F F T F F F F T T ...... | Jan 18, 2011 at 10:31:28PM | |
| $0.25 | Mathematics | need help | Think of it in terms of counting.
...d and 6th-rank datum: 1-5 are below this and 6-10 are above. For probability distributions: 50% of the probability is below the median an... | Jan 18, 2011 at 6:12:05PM | |
| $2.00 | Mathematics | missing data - t test | Usa a different t-test: I explain how
...ot assume that the variances are the same. If, however, an F-test tells you that the variances are stast... | Jan 18, 2011 at 6:07:03PM | |
| $2.50 | Mathematics | Truth tables & Euler diagrams | A full walkthrough
... for the statement: ( p v ~q) ^ r Note that p v ~q is true in all cases except p false, q true. p q r expression T T...... | Jan. 18, 2011 at 02:54:29AM | |
| $1.00 | Biology | What are structures that are capable of growth and metabolism that have been... | Artificial life has yet to be produced...
...all of the time. Among these are many strains of yeast and Ev coli bacteria. In one... | Jan. 15, 2011 at 05:42:00AM | |
| $0.50 | Mathematics | Solving Equations | Do the same thing to both sides of the equation
...s the best I can tell you: isolate the quantity you wish to solve for by doing the same thing to both sides of the equation. For example if you have 1/a+1/b=... | Jan 14, 2011 at 4:24:06PM | |
| $1.00 | Physics | A 200g lead bullet is fired at an unknown angle... | Relating ballistics and thermodynamics.
...let at rest). And the change in potential energy is 0-m_bullet g h where h is the height of the cliff and g is the acceleration due to gravity. So we have (m_block c_block + m_bullet c_bullet)...... | Jan. 12, 2011 at 02:18:05AM | |
| $1.00 | Chemistry | ___K(s) + ___H2O(l) ___KOH(aq) + H2(g) What are the products in this... | Products and balancing
...uid water. If you want to balance the equation (fill in the bl... | Jan 04, 2011 at 8:12:21PM | |
| $1.00 | Chemistry | ___K(s) + ___H2O(l) ___KOH(aq) + H2(g) What are the products in this... | Products and balancing
... products are potassium hydoxide (aqueous solution) and hydroge... | Jan 04, 2011 at 8:11:06PM | |
| $5.00 | Biology | water science | Insects and Tubifex tubifex in streams
...ly Tubifex worms and no other macroinvertebrates is a sign that the stream is either low in oxygen or heavily polluted with organic matter or both; Tu... | Dec 29, 2010 at 6:29:17PM | |
| $5.00 | Mathematics | 5.22 A survey of employees at a large company found the following relative... | Full explanation
...ilities: 0.25+0.16=0.41. The probability that a random individual will have to travel between 6 and 15 miles to work is 0.41 (c) Since the categories are exclusive, draw a rectangle with 6 stripes....... | Dec 27, 2010 at 9:19:38PM | |
| $2.00 | Mathematics | If a 95% confidence interval for the dif | False An explanation of why.
... of two such point estimates of means will itself be Gaussian and symmetric about the point estimate. "Symmetric about the point estimate" means that the ... | Dec 14, 2010 at 9:33:34PM | |
| $5.00 | Mathematics | MATH QUESTION | Walkthrough with explanation
...nerally true of all distributions, but the normal distribution is one of several that has this property. d. The graph of a normal distribution is symmetric. Yes. Notice the square in the argument...... | Dec 12, 2010 at 9:20:16PM | |
| $1.00 | Mathematics | translating sentences into equations | How to do this.
...2)=$40*2+$30=$110 And after 4 hours the cost is C(4)=$40*4+$30=$190 That's all ther... | Dec 12, 2010 at 7:32:28PM | |
| $5.00 | Mathematics | Probabilistc problem | Adding normal (Gaussian) probability: I walk you through it.
... weeks 1 2 and 3 is independent this is a normal distribution with mean equal to the sum of the means and variance equal to the sum of the variance. So the mean is 160 units. To compute the...... | Dec 12, 2010 at 7:07:04PM | |
| $2.00 | Mathematics | sequence problem | You are almost correct.
... the form. 3/1= (1+2)/1! 4/(1*2)=(2+2)/2... | Dec 09, 2010 at 4:01:38PM | |
| $3.00 | Mathematics | Inclusion-Exclusion---Counting with Venn Diagrams | Counting it up using inclusion-exclusion
...in "the" and 24 possible places to insert "the" into this sequence (between the letters) The subtracted term may seem a bit trickier but let's break it down. There are 20! arrangements of the...... | Dec. 09, 2010 at 04:08:47AM | |
| $1.00 | Mathematics | Simplifying a product of radical expressions using the distributive property | Full walkthrough
...gain 20√10√10+15√10√2-8√10√2-6√2√2 And now recognize e.g. that √10√10=10... | Nov 29, 2010 at 5:35:14PM | |
| $1.00 | Mathematics | Statistics | Standard normal statistics: a walkthrough of this.
...s 0.0139 The percentile rank is thus 1.3% c. Buffy was told that her IQ score, as a percentile rank, was a 67. What is her IQ score? Since standard tables measure from 0 and not from negative...... | Nov 29, 2010 at 1:19:49PM | |
| $3.00 | Mathematics | Algebra Mixture | Full walkthrough
...e second solution is 0.41*V2 About how much of each solution is does she need to produce 50 gallons of solution that is 31% a... | Nov 22, 2010 at 2:26:00PM | |
| $2.00 | Physics | Marble Physics Problem | Step-by-step using energy methods.
... second incline. Its potential energy at its maximum height on the second incline will thus be equal to its potential energy at its maximum height on the first incline, less the rotatational...... | Nov 17, 2010 at 1:36:54PM | |
| $5.00 | Mathematics | Analyze the units, fully explain step by | Unit analysis here, step by step.
... Here's how to do this by unit analysis. First figure out the volume in terms of the circumference and depth. Solve C=2πr for radius r=C/2π Now substitute this into your formula for volume and...... | Nov. 16, 2010 at 02:39:58AM | |
| $5.00 | Mathematics | Solve an easier problem to get answer pls help before 11 am | Reducing to a much easier related problem--no textbook sum formulas required, just the area of a rectangle
...ning of the first. So we compute the number of boxes in our first triangle by figuring out the number of boxes in the combination and dividing by 2. In the combination there are 99*100 boxes=9900...... | Nov. 12, 2010 at 02:38:27AM | |
| $3.00 | Mathematics | PLS HELP! Before 11 am eastern time today,THX | Approaching this by unit analysis.
... tons/pound. The company saves 1 gram/cup 1 gram/cup * 1 lb/454 g * 1 ton/2000 lb= 1/908000 ton/cup savings How many cups/year? c... | Nov. 12, 2010 at 02:23:35AM | |
| $1.00 | Mathematics | lost and confused | Dont forget the factor of two...
...orial choices overall. Likewise there are 7! ways to order the women by themselves. Now if they alternate, having previously deter... | Nov 10, 2010 at 7:16:20PM | |
| $1.00 | Mathematics | how many yards are 3 rods? | Rods to yards
...eet 3 feet is 1 yard... | Nov. 10, 2010 at 12:25:36AM | |
| $1.00 | Mathematics | precalculus | If youd like to get it in terms of just x and y, no logarithms
... ln x take the e... | Nov. 10, 2010 at 12:06:25AM | |
| $0.50 | Mathematics | problem solving solve an easier related | A picture, if you must.
...graphics, but f... | Nov 09, 2010 at 4:45:25PM | |
| $5.00 | Mathematics | curve sketching | Everything but a picture, with explanation
... is always positive, we look at the numerator to determine where f'(x) is positive. f'(x) is positive, and therefore f(x) is increasing, where x>0. It is negative (and therefore f(x) is increasing)...... | Nov. 09, 2010 at 02:51:12AM | |
| $5.00 | Mathematics | Solve an easier related problem. Draw Di | How to do this: what picture to draw and how to count it up
...many points can one tile cover" and the answer is four. Draw yourself a scale drawing of a tile laid over these grid lines, aligned "square" with half-i... | Nov 08, 2010 at 11:03:03PM | |
| $5.00 | Mathematics | working backwards | Working backwards: re-filling the doughnut case
... placed his order, there were four. The second customer asked for half of the doughnuts left plus half of a doughnut more. Where N is the number of doughnuts ... | Nov 08, 2010 at 9:12:46PM | |
| $1.00 | Physics | A point on the rim of a 0.15m radius rot | Fully explained.
... a centrip =v 2/r It takes a bit of calculus to show this rigorously; I am certain it is explained in your textbook. What is worth keeping in mind is that angular speed is independent ... | Nov 07, 2010 at 10:20:24PM | |
| $2.00 | Mathematics | Basic Probability: Chessboard... | This chessboard probability problem broken down.
...ackle the rook threatening the bishop first, because it is easier. Place the bishop on the board. The rook will attack the bishop if it is either in the same row or same file. No matter where you...... | Nov 07, 2010 at 4:53:20PM | |
| $20.00 | Biology | BIOLOGY EXPERTS: Questions about GENETICS | All problems with explanation.
...X'X. Their offspring can be as follows: Female X'X' black: X' from the father and X' from the mother Female X'X tortoiseshell: X' from the father and X from the mother Male YX' black: Y from...... | Nov. 07, 2010 at 03:20:22AM | |
| $3.00 | Mathematics | Gauss-Jordan Elimination | Using Gauss-Jordan elimination to solve this system
... 0 Subtract 2* the third row from the second row and 2/3 * the third row from the first row 1 1/3 0 40/3 0 1 0 4 0 0 1 0 Now subtract 1/3 times the...... | Nov. 04, 2010 at 12:26:50AM | |
| $5.00 | Mathematics | From the book Crossing the River with Dogs ( Ch. 8 can be seen on google books) | Solving by finding a pattern
... below each of the row 2 dots and connect them to their parent dot with line segments, labeling the row "3". By now it should be evident that in the Nth generation there are 3 times more "dots" (lett...... | Nov 03, 2010 at 2:34:59PM | |
| $5.00 | Mathematics | unsure about Strategy | The solution is similar to matrix logic
...won second match** The solution is in the same spirit as matrix logic--we successively eliminate possibilities-- but it is not matrix logic.It isn't shoehorned easily into any of Crossing the River...... | Nov. 03, 2010 at 05:16:24AM | |
| $1.00 | Physics | Physics w/power | inferring mass and kinetic energy from momentum and energy
...e the speed is p/m, or in terms of the given information p/(p/2KE) or 2KE/p, 25.... | Nov. 01, 2010 at 02:53:48AM | |
| $5.00 | Mathematics | Please Help Guess and Check or Unit Analysis by 11am Mon. | Doing it by guess-and-check in a systematic way.
...adult tickets to start. This amounts to $110--too low and no way to increase it with the number of children's tickets fixed. We note that every time we swap an adult tickets for a junior ticket we...... | Nov. 01, 2010 at 02:32:37AM | |
| $5.00 | Mathematics | Parametric or non-parametric statistics | Parametric or nonparametric: responses with reasoning
... any assumptions about the shape of the rating distribution. We instead want merely to use empirical distributions. Specifically, the (nonparametric) Mann-Whitney U test is appropriate. (c) NP...... | Oct. 29, 2010 at 03:13:49AM | |
| $5.00 | Mathematics | Cannot be answered thru use of variables | 2-3 subproblems, with both pattern recognition and guess-and-check incorporated as well.
... Batty has both nightmares tonight he will also have both nightmares 247 days later. Since 19 and 13 are prime numbers he will not have both nightmares any time between now and 247 days later. Guess...... | Oct 28, 2010 at 9:00:51PM | |
| $1.00 | Physics | Rotational Motion | Full walkthrough.
...just multiply to get the magnitude τ = 0.5 m * 100 N =50.0 N m , and we read off the directions by drawing ourselves a picture: counterclockwise around the north, clockwise around the south. "2. ...... | Oct 27, 2010 at 10:31:24PM | |
| $0.50 | Mathematics | Look for a pattern? | Try "subproblem" in a trivial sense
..."subproblem" is so small. First ask "how many... | Oct. 27, 2010 at 03:21:19AM | |
| $3.00 | Physics | Physics w/power | A complete walkthrough, from a physics instructor.
...s conserved. We have as a general result (see your textbook) where v is the outgoing velocity and u is the incoming velocity v 1= (u 1*(m 1-m 2)+2m 2u 2)/(m 1+m 2) Here... | Oct 25, 2010 at 3:18:47PM | |
| $2.00 | Mathematics | differentiable function | Chain rule: this example worked out the best possible given the information provided.
...e of d/dx f(√x) when x=4 d/dx f(√x) = f'(... | Oct 23, 2010 at 1:28:04PM | |
| $1.00 | Mathematics | 14-3B #7 | Size transforms and slides (translations)
...(5,9) and B goes to (-3,9) (b) First we slide right one and up three. A goes t... | Oct. 22, 2010 at 01:34:32AM | |
| $1.00 | Mathematics | 14-B #7 | Where to draw your line.
...y that this is where the line should be by ho... | Oct 21, 2010 at 11:00:30PM | |
| $0.95 | Mathematics | help me understand this math problem | How to infer the sales tax rate from the amount of tax levied--a full explanation
...mpute the tax. E.g. the tax on $10 if the local rate is 7.75% is $10 * 7.75/100=77.5 cents, or 78 cents if we roun... | Oct 21, 2010 at 10:54:58PM | |
| $20.00 | Mathematics | Help to understand question that uses Data | A walkthrough of this Bernoulli trials/basic probability HW.
... are a bit different than probability. The odds of something happening are the ratio the chances that something happens to the chances that something will not. In this case there is a 5/8...... | Oct 21, 2010 at 7:39:49PM | |
| $1.00 | Physics | system of particles and rotational motion | How cats land on their feet, from a physicists perspective
...re retracted, rear legs are extended (controlling moment of inertia so that rotation about the horizontal axis is small compared to that of the front of the body), and the front is righted. The cat...... | Oct 15, 2010 at 2:53:55PM | |
| $1.00 | Physics | system of particles and rotational motion | How cats land on their feet, from a physicists perspective
...end forward so its axis of rotation is between horizontal and vertical, not horizontal, while the rear remains horizontal. Front legs are retracted, rear legs are extended (controlling moment of...... | Oct 15, 2010 at 2:48:06PM | |
| $3.50 | Mathematics | Anyone understand this??? | How to do it using truth tables--including one case of your eight done as an example
... but I'll tell you how to do it using truth tables. I presume from the title of your previous question that this is how you are expected to cover it. Deductive rules are, of course, much easier. T...... | Oct. 12, 2010 at 12:49:43AM | |
| $0.25 | Mathematics | what rational number comes between 0 and | one of many
...s one of infinitely man... | Oct 11, 2010 at 4:32:35PM | |
| $3.00 | Mathematics | Venn Help Please..... | How to get from your Venn diagram to answers--"inclusion-exclusion" counting explained.
... easily. If you look at your "tomatoes" region in the Venn diagram it should be partitioned into four pieces: tomatoes only tomatoes and zucchini but not cucumbers tomatoes and cucumbers but not...... | Oct. 11, 2010 at 02:52:14AM | |
| $6.00 | Mathematics | OMG, Please help m, from Crossing the River with Dogs text | This one is a bit more amenable to guess-and-check--we establish bounds and narrow them.
...the interval, we try 8. By the base method, we have 14700 ci. By the height method, we have 14580. The base method gave more of an increase than the height method. So our interval has been...... | Oct 10, 2010 at 10:53:05PM | |
| $2.00 | Physics | A sledge loaded with bricks has a total | This problem made simple--step by step.
...la T cos 20.2° - μmg + μT sin 20.2°=0 Collect T terms and factor: T (cos 20.2°+ μ sin 20.2°) = μmg T= μmg/(cos 20.2°+ μ sin 20.2°) (b) Just multiply the horizontal component of the...... | Oct 10, 2010 at 6:28:20PM | |
| $10.00 | Physics | force from 2 objects hitting | You cannot determine the force from this information alone. (A working physicist explains.)
...ce. The other is the amount of time the objects were interacting during the collision. Using the relationship between impulse (average force times time) and momentum we can arrive at an estimate of...... | Oct 10, 2010 at 6:14:03PM | |
| $2.00 | Physics | A 7.80-g bullet moving at 590 m/s penetr | Work, energy, and the mean force on a bullet.
...oving at 590 m/s penetrates a tree trunk to a depth of 6.4 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. All of the kinetic ... | Oct 10, 2010 at 1:32:12PM | |
| $6.00 | Mathematics | Please help me understand this problem | Counting Ajis options, with some guessing and checking.
... do it with a bit of guess and check: First argue that the number of ways he can arrange his day is equal to (number of ways he can do things on shore)*(number of ways he can do things on water)*(nu...... | Oct 10, 2010 at 1:14:11PM | |
| $1.00 | Mathematics | You are given three white balls, one red | Its a matter of conditional probability; I walk you through it.
...ability of winning is equal to the probability that you choose the box with the red ball multiplied by the probability that ... | Oct. 10, 2010 at 04:07:46AM | |
| $7.00 | Mathematics | I need complete answers with how to get full explanations | A full walkthrough.
... the complete answer. #66 Here we need to get both rational expressions into a form with a common denominator. It will help to factorize both denominators first. 2x/(x²-9) 3x/(x² 4x 3) We...... | Oct 09, 2010 at 5:36:26PM | |
| $1.75 | Mathematics | A certain mature animal weighs 800 lb an | A scaling problem: animal heights and animal weights.
...ube of length, so then weight is also proportional to the cube of length.... | Oct 08, 2010 at 9:11:10PM | |
| $3.00 | Mathematics | Guess and Check | Doing it as guess-and-check, followed by an algebraic solution
...r guess-and-check answer (and identify a pattern here) let's write down the equation we'd ultimately have to solve if we wanted to do this directly. Where W is the number of women, S=W 0.9W=26239 Now...... | Oct. 07, 2010 at 11:47:48AM | |
| $25.00 | Mathematics | Math 209 | A walkthrough of all 15
...ect terms on the left. Simplify the fraction on the right. w-1=3w(w+1)/20 Multiply both sides by 20 20w-20=3w(w+1) Thoroughly multiply the right hand side 20w-20=3w²+3w Now collect all terms...... | Oct. 07, 2010 at 07:10:21AM | |
| $6.00 | Mathematics | MATH GRAPH QUESTION | This graph, plus discussion of another.
...rt.com/wiki/File:Major_greenhouse_gas_trends_png This is a collection of five plots, each showing the time evolution of the concentration of a major greenhouse gas. Greenhouse gases are the major...... | Oct. 07, 2010 at 01:18:28AM | |
| $1.00 | Mathematics | F(X)=2|X+1|-3 GRAPH THIS FUNCTION | I describe how to draw this, and explain why.
...1| The +1 part means that we offset to the left whatever we would have without it, just as ... | Oct. 07, 2010 at 12:19:46AM | |
| $4.00 | Mathematics | Applications | Cornies and Oaties: a two variable linear system.
...exacty 24 grams of protein and 210 grams of carbohydrates?" Let's write down formulae for the quantity of carbohydrates and protein provided by Cornies (C) and Oaties (O) P... | Oct 06, 2010 at 7:58:42PM | |
| $5.00 | Mathematics | Discussion Forum: Alternation Series Test | Estimating the sum of an alternating series that passes the alternating series test, in ones own words.
...ero as n→∞ and their absolute values are strictly decreasing. There is a further result for sums that pass this test, an... | Oct 05, 2010 at 6:11:59PM | |
| $2.00 | Physics | Power | This one is a bit trickier than it looks: I (a college physics instructor) walk you through it.
...onent of his weight, mg sin φ where φ is the angle of the slope, is exactly opposed by the retarding force, which must also then be mg sin φ but oppositely directed. We will assume that the...... | Oct 05, 2010 at 5:42:02PM | |
| $0.30 | General-Questions | Math............................ | The answer.
... together... | Oct 05, 2010 at 3:04:10PM | |
| $5.00 | Mathematics | Problem Solving Class( Looking for a Pattern) | Roo and Tigger: A walkthrough and thorough explanation.
...gger travels 2*3 feet. They are traveling at the same average speed. But who wins? The answer is Roo. Roo can make 100 feet "even... | Oct 05, 2010 at 3:02:03PM | |
| $1.00 | Mathematics | Into to Management Science | This elementary constrained profit optimization /linear programming problem answered.
...r, and 2 ounces of herbs. Profits for a bag of Lime chips are $0.40, and for a bag of Vinegar chips $0.50. 1. What is the formulation for this problem? P=$0.40 L + $0.50 V (profit) ... | Oct 02, 2010 at 11:31:45PM | |
| $1.00 | Political-Science | Can you think of other reasons why the E | One reason
...acy but as a federal republic, to them the obvious federalism of the El... | Oct 02, 2010 at 10:23:45PM | |
| $1.00 | Mathematics | Need Help step by step in math | Step by step: This expression both multiplied through and thoroughly factorized
...ze this futher: First we divide the obvious common factors out of the left and right factors. The left hand factor has a common factor of 4 and the... | Oct 02, 2010 at 10:19:01PM | |
| $0.25 | Mathematics | i need u to factor 10u+60 | A quick factorization
...tor. 10u+60=10(u+6) W... | Oct 01, 2010 at 2:28:46PM | |
| $1.00 | Mathematics | A project has a 50% chance of doubling y | Expectation value--your financial example answered.
...investment is 2m-m=m. In the case of halving, the return on investment is m-m=-m. To find the ex... | Oct 01, 2010 at 2:27:00PM | |
| $1.00 | Chemistry | i need this ASAP | In order from lowest to highest with numbers and very brief explanations.
...85K (nonpolar) HCl 187... | Oct 01, 2010 at 1:27:21PM | |
| $4.00 | Physics | Physics 3 Questions | A complete walkthrough of each, from a physics instructor.
...rictionless pulleys. The objects move, and the coefficient of kinetic friction between the middle object and the surface of the table is 0.100. (a) What is the acceleration of the three objects? Tre...... | Oct. 01, 2010 at 06:43:45AM | |
| $3.00 | Physics | Physics Question 13. Just One Question | Centripetal acceleration and centripetal force: explanation plus numerical answers (from a physics instructor)
...(a) the magnitude of the centripetal acceleration and (b) the magnitude of the centripetal force for Car A, (c) the magnitude of the centripetal acceleration and (d)... | Oct. 01, 2010 at 05:49:20AM | |
| $5.00 | Physics | Physics 3 Questions | A complete walkthrough of each, from a physics instructor.
...kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30.0° with respect to the horizontal. The coefficient of kinetic friction between...... | Oct. 01, 2010 at 05:43:27AM | |
| $1.00 | Biology | why would you predict that an animal cel | Hypotonia and bursting, explained by a biophysicist.
...ff cell wall made up (primarily) of cellulose, which does not tear at the forces associated with cell's turgor pressure, and at some point exerts an equal and opposite force back on the plant cell...... | Oct. 01, 2010 at 01:56:37AM | |
| $5.00 | Mathematics | Please help me understand this Calculus II problem. | This integral picked into pieces and thoroughly explained (by a college instructor).
...r radius). Therefore we know it is not a washer integral but instead a shell integral. The factor of 2π out front should also be a clue, but it's not a certain giveaway as 2 could easily be...... | Sep 30, 2010 at 5:33:41PM | |
| $2.00 | Mathematics | Please help me understand this Calculus II integration problem. | Finding the area using the washer method.
...when y is negative we are interested only in positive x and y. The bounds of the region of interest are thus x=0 and x=1--this is where these graphs cross. The area of a washe... | Sep 30, 2010 at 5:09:10PM | |
| $5.00 | General-Questions | SOF Copyrights Infringement | Plagiarism vs "plagiarism detected", also "Substantial similarity", derivative works, and U.S. copyr
... also recommend either reading up on the law concerning "Fair use" and "derivative works" or on getting a very good lawyer before somebody hauls you to court. To quote somebody's work in certain...... | Sep 30, 2010 at 4:57:47PM | |
| $5.00 | Mathematics | Please help me understand this Calculus II problem. | This integral picked into pieces and thoroughly explained (by a college instructor).
...of two squares (inner radius and outer radius). Therefore we know it is not a washer integral but instead a shell integral. The factor of 2π out front should also be a clue, but it's not a...... | Sep 30, 2010 at 3:57:35PM | |
| $2.00 | Mathematics | Please help me understand this Calculus II integration problem. | This time around, we will find volume using the washer method.
...nvert x=√y to y=x² (get heights in terms of x) but noting that since the first of these is pure imaginary when y is negative we are interested only in positive x and y.... | Sep 30, 2010 at 3:45:31PM | |
| $2.00 | Mathematics | Please help me understand this Calculus II integration problem. | Volume set up as a cylindrical shell integral: this problem as an example.
... the general form of cylindrical shell integration is 2π ∫ radius(x) height(x) dx Now we set up the integral in x to do the integral... | Sep 30, 2010 at 3:37:07PM | |
| $5.00 | Mathematics | Please help me with this Calculus II graphing problem. | Solution with explanation and two attached graphs.
...(cos x - sin 2x) from -π/2 to +π/6. The second part is -∫(cos x - sin 2x) from π/6 to π/2 The third part is ∫(cos x - sin 2x) from π/2 to 5π/6 and the fourth part is -∫(cos x - sin...... | Sep 30, 2010 at 3:24:37PM | |
| $0.95 | Mathematics | Find the product of 8 and the sum of .03 and 0.002 | The solution, with explanation, in plain language, for under a $, from a college instructor.
...d 0.0002) We will be multiplying 8 times the quantity in pa... | Sep. 30, 2010 at 07:44:12AM | |
| $4.00 | Mathematics | QNT561 DQ2 | Answers to each except the last, with explanations.
... 43, 31, 31, 27, 27, 27, 24 1. Explain your answers to the following questions with definitions, and contextual meaning by providing examples for operationalizing the...... | Sep. 30, 2010 at 07:33:25AM | |
| $1.50 | Mathematics | Need to know step by step process | A complete walkthrough: finding the 90th percentile of a list of data.
...72, 77 Find the sample 90 th -Percentile processing time for the sample measurements." Step 1: Order the data. Re arrange the data so that they are in order:... | Sep. 30, 2010 at 06:11:20AM | |
| $2.00 | Mathematics | math 3.17 | A walkthrough of each problem, with some worked as examples.
... the longest side is two inches greater that twice the shorter side. The hypotenuse is two inches less than three times the shorter side. Find the measures of all three sides. l=s+2 h=3s-2 a...... | Sep. 29, 2010 at 02:25:20AM | |
| $1.00 | Mathematics | what is 8 and 1/15 - 5 and 11/20 | Subtracting compound/vulgar fractions: a walkthrough
...5=121/15 5 and 11/20=5*20/20+11/20=111/20 Step 2: Convert these... | Sep 28, 2010 at 4:46:05PM | |
| $1.00 | Mathematics | I have more ones than tens. The value o | A one-line explanation
...8 tens so there must be... | Sep 28, 2010 at 4:32:41PM | |
| $2.00 | Mathematics | arithmetic | Each one done.
...9 52/9 5/6to the third multilpied by 2/5 to the third: (5^3*2^3)/(3^3*2^3*5^3) 1/27 the sum of 0.633+46 46.0633 find the whole for:567 l... | Sep 28, 2010 at 2:29:43PM | |
| $0.25 | Mathematics | write in exponential form 3x3x3x3x3x3 | From multiplication to exponentiation.
...plied. N 3s mult... | Sep. 28, 2010 at 10:04:59AM | |
| $1.25 | Mathematics | Lakeshia | A walkthrough
...*$200 F is the contents of the fund, N, an integer, is the number of months since the start. It is not clear whether the money is added in lump sums at the end of every four months or not; the e... | Sep. 28, 2010 at 10:02:52AM | |
| $1.00 | Mathematics | I am inside the path.I am the difference | I have the answer, even though I have no idea where this "path" business comes from.
...1,2,3}--it doesn't take much to compute this, since the "ou... | Sep 27, 2010 at 10:18:03PM | |
| $1.00 | Mathematics | Algebra | Questions about inequalities.
...e if the relationship satisfied is "less than or equal to" (or "greater than or equal to") 2. How do you know where to shade the graph of an inequality? Shade the side that satisfies the...... | Sep 27, 2010 at 2:24:26PM | |
| $1.00 | Physics | Imagine a great sphere of water (of density 1.00 x 103 kg/m3)... | Gravitational acceleration of a uniform sphere at its surface, relative to that of earth. A walkthrough.
... it was a point particle concentrated at its center. (This is a fairly intuitive consequence of Gauss's Law.) At the surface of the earth, neglecting local variations, we have g= G m e/r e². ...... | Sep 26, 2010 at 9:49:21PM | |
| $1.00 | Physics | Centripetal Force and Gravity | Walkthroughs from an intro. physics instructor: two exercises in which constant gravity is anti-centripetal.
...l change. At the bottom of the mass's travel gravity is in the anticentripetal direction. Thus require T-mg=mv/r where T is the tension force (displayed on the scale.) Solve: T=mv/r+mg=m(v/r...... | Sep 26, 2010 at 9:31:58PM | |
| $1.00 | Physics | Centripetal Force and Gravity | Walkthroughs from an intro. physics instructor: two exercises in which constant gravity provides some centripetal force.
...on the scale.) Solve: T=mv/r+mg=m(v/r+g) I presume you can take g=9.8 m/s 2 and compute the answer. 2. "A scale is fitted into the seat of a roller coaster car, and a person weighing 800 N...... | Sep 26, 2010 at 9:30:07PM | |
| $1.00 | Mathematics | Need help with a question | How many of each sold: a complete walkthrough.
...nto 1. Applied here, calling the number of white shirts sold W and the numer of red shirts sold R, we have $18.... | Sep. 25, 2010 at 11:07:40AM | |
| $1.00 | General-Questions | identify a professional association or o | A few professional associations
...can Physical Society American Associa... | Sep. 25, 2010 at 07:36:28AM | |
| $5.00 | Mathematics | math 096 | Walkthrough: Batting averages.
...uming an average of 540 “at bats” per season, how you would you calculate the average number of “hits” for a player in the same season? Demonstrate your method using three of the players in...... | Sep. 25, 2010 at 02:24:52AM | |
| $5.00 | Mathematics | 1. At a certain business, all 300 employ | An inclusion-exclusion counting exercise
...ract the cardinality of the intersection to avoid double counting. This isn't standard notation but it's intuitive. So we substitute the information at hand. 300=175+155-N (cat1∩cat2). N (c...... | Sep 24, 2010 at 9:42:55PM | |
| $3.00 | Mathematics | How do you know when an equation has | Beware: many of the tutorials you have been given are incomplete or wrong. I give a more thorough treatment here.
...er. But beware examples such as sin(x)=x, Here you take the arcsine of a function . This one does not have infinitely many solutions. But sin(1/x)=x does. Graphing the RHS and LHS and...... | Sep 24, 2010 at 9:31:20PM | |
| $1.00 | Mathematics | How do you know when an equation has | Beware: Many of the tutorials you have been given appear incomplete or wrong--I give some pointers here.
...ut beware examples such as sin(x)=x, Here you take the arcsine of a function . This one does not have infinitely many solutions. But sin(1/x)=x does. Graphing the RHS and LHS and looking for...... | Sep 24, 2010 at 9:03:31PM | |
| $1.00 | Mathematics | How do you know when an equation has | Infinitely many solutions: some pointers.
...ny solution to obtain another. But beware examples such as sin(x)=x, Here you take the arcsine of a function . This one does not have infinitely many solutions. But sin(1... | Sep 24, 2010 at 8:56:51PM | |
| $5.00 | Mathematics | finding the inverse of a function | An elementary example of function inversion.
...main and the range of f^-1(x) Remember that the domain of the inverse is the range of the original funct... | Sep 23, 2010 at 10:32:30PM | |
| $5.00 | Mathematics | use the squeeze theorem | This is the archetypal Squeeze Theorem example.
...e cannot use ordinary means to determine this limit. But we can ... | Sep 23, 2010 at 10:21:09PM | |
| $1.00 | Mathematics | Need help to solve a question | How many of each type was sold: a walkthrough.
...+P=75. We also can write down a function that is the total amount of money collected in terms of D and P: M(D,P)=$2.25*D... | Sep 23, 2010 at 2:29:09PM | |
| $1.00 | Mathematics | By looking at two linear equations, how | All three, explained.
...th numbers: x+2y=7 13x+26y=-42 This is a simple case of what is called "linear dependence", and means that the equations have no simultaneous solution. If you try to invert the matrix correspondin...... | Sep. 23, 2010 at 05:08:13AM | |
| $1.00 | Physics | Given that Jupiter's diameter is 11.2 ti | Complete walkthrough of this scaling problem.
...=11.2 r Earth . (We're actually told something about diameters, but diameters and radii scale the same.) So now we just substitute again: V Jupiter /V Earth = (11.2 r Earth) ³/r Earth ³ We...... | Sep. 23, 2010 at 03:37:35AM | |
| $0.75 | Mathematics | Suzanne and her friends ate 8/36 of a la | Fractions in lowest terms: An inexpensive step-by-step walkthrough--not just the answer.
...ion: (1) Write out the factors of the denominator. 1 2 3 4 6 9 12 18 36 (2) Write out the factors of the numerator.... | Sep 22, 2010 at 8:03:08PM | |
| $1.00 | Chemistry | Help me calculae the average atomic mass | Its a weighted average--here is the calculation.
...ilities we divide the percentages by 100. So we just sum 62.929599 amu * 0.6917 64.927793 amu * 0.3083 Fin... | Sep 20, 2010 at 11:00:14PM | |
| $1.00 | Biology | Life Science | Water, nutrients energy, shelter, and space
...y, shelter, and s... | Sep 20, 2010 at 10:36:06PM | |
| $2.00 | Mathematics | ALGEBRA HELP NOW! | A complete walkthrough
...)^2=18, what are exact solutions? Exact solutions are solutions in terms of radicals and fractions. We first take the square root of both sides, being sure to put the ± sign: x-5=±√18=±3√2 N...... | Sep 20, 2010 at 10:02:56PM | |
| $1.00 | Physics | Physics | A walkthrough of both questions .
... from rest, the block drops 0.150 m before momentarily coming to rest, after which it moves back upward. (a) What is the spring constant of the spring? (b) Find the angular frequency of the block’s...... | Sep. 20, 2010 at 04:10:03AM | |
| $0.25 | Mathematics | i need to learnm, math, division, fractions, decimals, percentages, and algebra 28yrs.old student | What are you looking for?
... regular help w... | Sep. 20, 2010 at 01:37:48AM | |
| $1.00 | Biology | What important molecule does the nucleus contain | Nuclear contents
...modeling proteins, RNA polymerases, and expressi... | Sep. 20, 2010 at 12:43:23AM | |
| $1.00 | Mathematics | Your company has decided to create three | This is a system of linear equations; I give one solution method step by step.
...A=398 (programmer equation) 6M+4C+4A=164 (artist equation) 1M+2C+1A=58. (mathematician equation) As usual, this can be converted to a matrix equat... | Sep. 18, 2010 at 03:26:01AM | |
| $1.00 | General-Questions | The head of the Psychology Department at | For the same reason that kids with ADD are given Ritalin and similar amphetamines.
... both amphetamine-like drugs. Co... | Sep 17, 2010 at 10:37:36PM | |
| $1.00 | Mathematics | Trigonometry Question | arccos (-sqrt(2)/2)
...miliar if you see that (√2)/2=1... | Sep 17, 2010 at 10:30:37PM | |
| $1.00 | Biology | genetics hw 21/22 | A worked example of basic Mendelian inheritance.
...robability that the nonalbino mice are heterozygous is equal to the probability that they inherited a from the mother and A from the father plus the probability they inherited A from the mother and a...... | Sep 17, 2010 at 9:30:52PM | |
| $10.00 | Mathematics | BA 215 Business static | What to do for each problem.
...roblem becomes trivial. P(C)=P(C|D)P(D) P(C| not D) P(not D) Just solve the equation for P(D). You will want to exploit here that P(not D)=1-P(D). (b) Bayes's Rule comes in handy here. P(D|C)=P(...... | Sep 17, 2010 at 9:16:29PM | |
| $5.00 | Physics | two dimensional kinematics | Two projectile problems in two-dimensional kinematics.
...x v 0,y / g = range = 6.8 m. We're almost there: the question asks us about a speed and gives us an angle. Let's call this speed v and the angle θ. v 0,x =v0 cos θ v 0,y =v0 sin θ. ...... | Sep. 17, 2010 at 04:30:32AM |