Answer
$69$
Work Step by Step
We need to use the formula $ a_n =a_1+(n-1) d $
Here, $ a_1=-7$ and $ d=4$
Plug $ n=20$
$ a_{20}=-7 +(20-1) \times (4) $
or, $=-7+76$
or, $ a_{20}=69$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 10 - Review Exercises - Page 1124: 19
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