Question

What is the sum of a 22-term arithmetic sequence where the first term is 57 and the last term is -27?



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330

Answer 1

\[\Large S_n = \frac{n(A_1 + A_n)}{2}\] does that help?

Answer 2

lol no it still looks like Latin to me XD

Answer 3

n = -4

Answer 4

sorry common difference is -4

Answer 5

Sn means sum of the terms (that's what you're looking for)
n is the nmber of terms
A1 is the first term
An is the last term

Answer 6

do you know how to get it now?

Answer 7

yes :)