Intermediate Algebra for College Students (7th Edition)

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


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.
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