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Question

$1.00 PLEASE HELP FIND SUM OF SEQUENCE

  • From Mathematics: Algebra
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  • Due on Jun. 08, 2010
  • Asked on Jun. 08, 2010 at 12:03:01AM
Asked by :
kari8281
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Q:

please help find the sum of the first 90 terms:

-6,-3,0,3,6,9........

 

please help find the sum of the first 9 terms:

40,20,10,5.......

 

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$1.00
correct answers . 100 percent A++ Please Rate
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  • Posted on Jun. 08, 2010 at 12:23:59AM
Posted by :
bertobuay1
bertobuay1
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A:
Preview: ... or an AP n is the term eg. 90 a is the first term d is the difference b/w the t ...
The full tutorial is about 63 words long .
 
$2.00
AP and GP series Q. Solved - Stepwise
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  • Posted on Jun. 08, 2010 at 12:58:45AM
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A:
Preview: ... re, a1 = first Term = -6 and d = common difference = b –a = -3 – (-6) = -3 + 6 = 3 Clearly, it is an AP with n(no. of terms ) = 90 AND, the formula for the su ...
The full tutorial is about 182 words long .
 
$1.00
solution for you.
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  • Posted on Jun. 08, 2010 at 01:15:24AM
Posted by :
GangadharSenapati
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A:
Preview: ... rms = n = 90                                                             Sum of n terms = s n = (n/2)[2a + (n-1)d]                     s 90 = (90/2)[-12 + (90-1)*3] = 45[-12 + 267] =  45[255] = 11475 ...
The full tutorial is about 121 words long .
 
$0.75
accurate answer A+++++ A.P and G.P.
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  • Posted on Jun. 08, 2010 at 01:28:21AM
Posted by :
besthelper
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A:
Preview: ... ........ first term=-6 and common difference=3 then sum of arethmatic progress ...
The full tutorial is about 35 words long .