Question

Find the sum of the given arithmetic series.
1)http://media.education2020.com/EVresources/648-12-02-00-00_files/i0210000.jpg

Answer 1

u know how to use sigma notation?

Answer 2

nope

Answer 3

on this problem youll start with n=1, you just plug that into the (2-3n). so with sigma notation youll just have (2-3(1))+(2-3(2))+(2-3(3)).... up till 5 since thats your limit

Answer 4

then add them all together and thats your answer

Answer 5

i got -49?

Answer 6

ill have to check hold up

Answer 7

i got -35

Answer 8

i did it again and i got -35 too

Answer 9

good work man! you helped a lot.

Answer 10

np