Question

Find the sum of the arithmetic sequence.
-10, -7, -4, -1, 2, 5, 8

11
-70
0
-7

Answer 1

you can add them up since there isn't that many

Answer 2

unless you want to do this:
\[a_{n}=-10+3n\]
where your first number is given when n is zero
\[\sum_{n=1}^{7}(-10+3n)\]
and use some formulas to figure out the sum

either way

Answer 3

i got 14 lol

Answer 4

@freckles am i right lol do you know the answer

Answer 5

I'm going to fix my sum
\[\sum_{n=0}^{6}(-10+3n)\]
anyways
\[-10+(-7)+(-4)+(-1)+2+5+8\]
\[-17+(-5)+7+8 \\ -22+15\]
I got something that isn't 14
let me know if I did something wrong

Answer 6

oh its -7 lol

Answer 7

adding is fun :p

Answer 8

It's -7...add -10+-7+-4+-1=-22 then add 2+5+8=15 add -15. To 22 = -7