Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 14 - Sequences, Series, and the Binomial Theorem - 14.2 Arithmetic Sequences and Series - 14.2 Exercise Set: 24

Answer

$a_{20}=-83$

Work Step by Step

The n th term of an arithmetic sequence can be calculated as: $a_n=a_1+d\times(n-1)$ Here: $n=20$, $d=-5$ and we have to find $a_{20}$. By substituting we get: $a_{20}=12+(-5)\times(20-1)=12-95=-83$ $a_{20}=-83$
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