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givi [52]
2 years ago
8

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

Mathematics
1 answer:
Sveta_85 [38]2 years ago
3 0

Answer:

40 terms

Step-by-step explanation:

the sum to n terms of an arithmetic sequence is

S_{n} = \frac{n}{2} (a₁ + a_{n} )

then

\frac{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

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