Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 9 - Conic Sections, Sequences, and Series - 9.3 Arithmetic Sequences - 9.3 Exercises: 15

Answer

$n=20$

Work Step by Step

$a_n=4+(n-1)6$ when $a_n=118$ $118=4+(n-1)6$ $\implies 114=(n-1)6$ $\implies 19=n-1$ $\implies 20=n$
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