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: 24

Answer

$n=22$

Work Step by Step

$a_n=2+\sqrt{n+3}$ when $a_n=7$ $2+\sqrt{n+3}=7$ $\implies \sqrt{n+3}=5$ $\implies n+3=25$ $\implies n=22$
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