anonymous
  • anonymous
Need help on thiss
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
-28
anonymous
  • anonymous
how did you solve it...i have 5 more problems like this..

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anonymous
  • anonymous
is there a way to put it into wolfram?
anonymous
  • anonymous
I looked at it then I thought of a number.
anonymous
  • anonymous
http://www.wolframalpha.com/input/?i=Sum%5B-2+n+%2B+4%2C+%7Bn%2C+4%2C+7%7D%5D
anonymous
  • anonymous
can you help me with these kind of problems?
anonymous
  • anonymous
Sure.
anonymous
  • anonymous
Given the sequence 9, 12, 15, which of the following is equivalent to
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anonymous
  • anonymous
thanks aloot..
mathmate
  • mathmate
You can split the summations, and evaluate each one separately. \[\sum_{4}^{7}-2n+4 = \sum_{4}^{7}-2n + \sum_{4}^{7}4\] \[= -2\sum_{4}^{7}n + 4\sum_{4}^{7} 1\] \[= -2(\sum_{1}^{7}n - \sum_{1}^{3}n ) + 4(4)\] \[= -2[ 7(7+1)/2 - 3(3+1)/2 ] - 16\] \[= -44 + 16\] \[= -28\]

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