Question

Evaluate the series

Answer 1

\[\sum_{n=3}^{8}5n\]

Answer 2

basically you plug in n=3, n=4,...,n=8 and add them up\[\Large \sum_{n=3}^{8}5n = 5*3 + 5*4 + 5*5 + 5*6 + 5*7+ 5*8\]

Answer 3

so 165?

Answer 4

idk, i didn't add it up. Probably. Looks reasonable.

Yes. Checked it in my head :P

Answer 5

okay im posting another one