Asked by Ciara


Find the indicated sum. Show your work.
4 k=1 (-1)^k(k+11)
Inbetween the 4 and k , Theres a backwards 3 sign
Answered by Steve
That's a sigma

4
∑ (-1)^k (k+11)
k=1

= (-12)+(13)+(-14)+(15)
= 2
Answered by Ciara
Thank you :)
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