Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 12 - Section 12.2 - Arithmetic Sequences - 12.2 Exercises: 13

Answer

$a_{n}=-0.5-0.2n$ $a_{10}=-2.5$

Work Step by Step

The nth term of an arithmetic sequence is $a_{n}=a+(n-1)d$ ---------------- $a_{n}=-0.7-0.2(n-1)$ $a_{n}=-0.7-0.2n+0.2$ $a_{n}=-0.5-0.2n$ $a_{10}=-0.5-0.2(10)=-0.5-2=-2.5$
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