Question

Hey who wants to help with this one?

Answer 1

\[\sum_{i--4}^{-2}-4i\]

Answer 2

Just add them up.\[\sum_{k=-4}^{-2}-4k=-4\sum_{k=-4}^{-2}k=-4(-4+-3+-2)=36\]

Answer 3

As you can see, I prefer k as my index....

Answer 4

Thank you very much :D

Answer 5

You've got it now?

Answer 6

Yes indeed I do