Answer
$a_{20}=-83$
Work Step by Step
Using $a_n=a_1+(n-1)d$ then,
\begin{array}{l}
a_{20}=12+(20-1)(-5)\\
a_{20}=12-95\\
a_{20}=-83
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 11 - Review - Page 667: 15
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