Answer
$-118$
Work Step by Step
Here, $a_1=15, d=-7$
n-th term an arithmetic sequence can be calculated as: $a_n=a_1+(n-1)d$
Thus, $a_n=15+(n-1)(-7)$
Also, $a_{20}=15+(20-1)(-7)=15+-133=-118$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 11 - Review Exercises - Page 869: 18
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