Question

Find the sum of the arithmetic sequence.

-10, -7, -4, -1, 2, 5, 8

Answer 1

@phi

Answer 2

is it infinite?

Answer 3

if no then -10-7-4-1+2+5+8

Answer 4

-7

Answer 5

one formula you can use is Sn = n/2{a1 + L]
where n = no. of terms a1 = first term and L = last term

Answer 6

thanks both of you :)

Answer 7

or you can just add them up of course!
yw

Answer 8

I realized what to do right after I posted it haha

Answer 9

yeah

Answer 10

but I like the formula, I can use it whenever in case there are a lot of terms

Answer 11

lol - i didn't think of just adding them up!

Answer 12

yes its useful when you are given the last term