Answer
$78$
Work Step by Step
Here $a_1=2 $ and $d=4$
$a_n=a_1+(n-1)d=2+(n-1)d$;
Thus,
$a_{20}=2+(20-1)4=2+(19)(4)$
or, $a_{20}=78$
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 - Mid-Chapter Check Point - Page 858: 4
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