Answer
$a_n=-7+(n-1)4$ ; $a_{20}=69$
Work Step by Step
Here, $a_1=-7, d=4$
n-th term an arithmetic series can be calculated as:
$a_n=a_1+(n-1)d$
Thus, $a_n=-7+(n-1)4$
Also, $a_{20}=-7+(20-1)(4)=69$
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: 15
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