Hi :) that was only a facet of the problem. i should have clarified but since that was a "free" question, I didn't want to make it too complicated. That was one of the formulas and sigma i was given to calculate a different sigma, which has 8 on top, i=1, and (i+i^2). So that sigma I stated in the problem was just for i. So, I was confused on how to approach it. Would I just plug in 8 to find the sum of that first sigma? Thanks!

hi! hm I'm confused by what two sigmas are in your problem, but if you are trying to find the sum from i=1 to 8 , then yes, you plug in 8 into the n(n+1)/2 to get 8*9/2 = 36. If you want to work out another problem, feel free to invite me :)