Question

What is the sum of a 29-term arithmetic sequence where the first term is 180 and the

last term is -16?

Answer 1

Answer is 2378

Explanation:

`sn = (n)/(2) (a + l) \\ here \: n = 29 \: \: a = 180 \: \: l = - 16 \\ s29 = (29)/(2) (180 - 16) \\ = (29)/(2) * 164 \\ = 29 * 82 \\ = 2378`

sum to 29 terms is 2378

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