Question

What is the sum of the finite arithmetic series?
(-10)+0+10+20+…+130

Answer 1

here is a better approach. Factor out a 10
10 (-1 + 0 + 1 + 2 + ... + 13)

see?

Answer 2

I'm confused

Answer 3

O.O

Answer 4

How did you do that

Answer 5

I'm so bad at math I'm sorry

Answer 6

do you know how to factor? 10 + 20 = 10(1 + 2) right?

Answer 7

Yeah I have no idea.

Answer 8

let's do an easier problem. Do you know how to factor (2 + 4) ?