Answer
$a_n=200+(n-1)(-20)$ ; $a_{20}=-180$
Work Step by Step
Here, $a_1=200, d=-20$
n-th term an arithmetic series can be calculated as:
$a_n=a_1+(n-1)d$
Thus, $a_n=200+(n-1)(-20)$
Also, $a_{20}=200+(20-1)(-20)=-180$
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: 16
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