Question

PLEASE HELP!!!!!! I HAVE BEEN STUCK FOR DAYS!!!!

Answer 1

40 terms

Explanation:

the sum to n terms of an arithmetic sequence is

`S_(n)` =
`(n)/(2)` (a₁ +
`a_(n)` )

then

`(n)/(2)` (- 4 - 82) = - 1720 ( multiply both sides by 2 to clear the fraction )

- 86n = - 3440 ( divide both sides by - 86 )

n = 40

the series has 40 terms