Question

Find the indicated sum. Show your work. (pictured below)

Answer 1

The sum of the indicated series will be:
[(-1)^1(-1+11))]+[(-1)^2(2+11)]+[(-1)^3(3+11)]+[(-1)^4(4+11)]
=[-1(10)]+[1(13)]+[-(14)]+[1(15)]
=-10+13-14+15
=4

Answer: 4