Answer
22 terms
Work Step by Step
We know that $a_n=a_1+(n-1) d$
Here, we have $a_{1}=-1; a_n=-83; d=-4$
Thus, we have
$-83=1+(n-1)(-4)$
or, $-4n+4=-84 \implies n=22$
Hence, there are $22$ terms
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 - Section 10.2 - Arithmetic Sequences - Exercise Set - Page 1060: 53
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