Answer
The $17^{\text{th}}$ term is $18$.
Work Step by Step
The$16^{\text{th}}$ is $21$ and the common difference is $-3$ so we simply add $-3$ to $21$ to get the $17^{\text{th}}$ term:
$a_{17}=a_{16}+d $
$a_{17}=21+(-3)$
$a_{17}=18$
Algebra 2 Common Core
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133186024
ISBN 13:
978-0-13318-602-4
Chapter 9 - Sequences and Series - 9-2 Arithmetic Sequences - Practice and Problem-Solving Exercises - Page 575: 27
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