Tutorials Posted by ping41

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...the second number x=2y So 2y+...		 Oct. 07, 2011 at 10:26:03AM
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...d:  (35y - 45x - 65) - (35y - 56x - 98) = 0 35y - 45x - 65 - 35y + 56x + 98 = 0 11x + 33 = 0 x = -33/11 = -3 Plug into the first equation, 7y - 9(-3) -13 = 0 7y + 27 - 13 = 0 7y + 14 = 0 y = -14/7 = -......		 Sep 22, 2011 at 2:59:51PM
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...) = C(n,k) p^k (1-p)^(n-k) = C(10,k) 0.65^k 0.35^(10-k) where  C(n,k) represents the number "n ch...		 Sep. 20, 2011 at 11:53:50AM
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...- 20x = 950 -5x + 1000 = 950 50 = 5x x = 1...		 Sep 18, 2011 at 3:47:12PM
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...ual.  9/16 + 1/2 = 9/16 + (1*8)/(2*8) ...		 Sep 16, 2011 at 3:40:39PM
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... to find t. Have 19 = 2t^2 - 3t So 2t^2 - 3t -1...		 Sep 16, 2011 at 1:05:35PM
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...oose a letter to be at the forth position. There are 3 letters left so 3 possible ways for this step. Then choose a letter to be at the fift...		 Sep. 16, 2011 at 10:59:54AM
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...6 = 0.2 and the distance to 7 is ...		 Sep 14, 2011 at 8:06:28PM
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...asked to find P(X|Y'). First, P(X intersects Y) = P(Y|X)P(X) so P(X intersects Y) = (0.7)(0.6) = 0.42 Now, P(X' intersects Y) = P(Y|X')P(X') so P(X' intersects Y) = P(Y|X')(1 - P(X)) = 0.25(1-0...		 Sep 14, 2011 at 8:02:11PM
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... 2a + 5a -4 +9 = 7a + 5 1/3(b +12)...		 Sep 14, 2011 at 6:30:13PM
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...cheeseburgers 6 like tacos and hotdogs we can fill in 8-x, 7-x, 6-x. Now, to fill in the number of people who like only hotdogs, add up x+(6-x) +(8-x)=14-x. Then subt...		 Sep 13, 2011 at 6:27:31PM
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... a profit of $5445. Want profit P = 1100, that is 11x - 55 = 1100. So 11x = 1100 + 55 =  1155. Divide by 11: x = 105. 105 pizza's have to be made to give a...		 Sep. 13, 2011 at 06:04:06AM
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...enue R = 15 x cost C = 4 x + 55 profit P = R-C = 15 x - 4 x - 55 = 11x - 55 To break even, need profit = 0. So 0 = 11x - 55 11 x = 55 so x = 5. Five pizza...		 Sep. 13, 2011 at 06:02:01AM
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...15 p - 4 p - 55 11 p = 55 so p = 5. Five pizza's need to be...		 Sep. 13, 2011 at 12:56:43AM
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...s the age of his son Anuj's present age" means: his father's age = 5 times his son's age. So his son's age is (100-x)/5. "Anuj's a...		 Sep. 12, 2011 at 04:59:26AM
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...n G. That is (F-G)(x) = F(x) - G(x) = (x² - 6) - (11 - x) = x 2 - 6 - 11 + x = x 2 + x - 5 (F-G)(-5) just means you substitute -5 into x: So...		 Sep 11, 2011 at 1:08:15PM
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...(7x-35). Any x is a valid input for (5x-7)/(7x-35) except the ...		 Sep. 11, 2011 at 11:46:17AM
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...olve. -4x - 0 = 16  Divide by -4:   x = -4 To f...		 Sep 10, 2011 at 2:24:04PM
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