Answer
See below.
Work Step by Step
The sum of the first $n$ terms of the sequence can be obtained by the formula $S_n=(a_1+a_n)\frac{n}{2}$ where $a_1$ is the first and $a_n$ is the last term.
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 11 - Section 11.2 - Arithmetic Sequences - Concept and Vocabulary Check - Page 839: 3
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