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 - Page 727: 14



Work Step by Step

$a_n=\frac{(-1)^n}{5n}$ $a_1=\frac{(-1)^1}{5\times1}=-\frac{1}{5}$ $a_2=\frac{(-1)^2}{5\times2}=\frac{1}{10}$ $a_3=\frac{(-1)^3}{5\times3}=-\frac{1}{15}$ $a_4=\frac{(-1)^4}{5\times4}=\frac{1}{20}$ $a_5=\frac{(-1)^5}{5\times5}=-\frac{1}{25}$
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