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1 Attachment
-28
how did you solve it...i have 5 more problems like this..

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is there a way to put it into wolfram?
I looked at it then I thought of a number.
http://www.wolframalpha.com/input/?i=Sum%5B-2+n+%2B+4%2C+%7Bn%2C+4%2C+7%7D%5D
can you help me with these kind of problems?
Sure.
Given the sequence 9, 12, 15, which of the following is equivalent to
1 Attachment
thanks aloot..
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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