#### 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 $
$a_{17}=21+(-3)$
$a_{17}=18$

Published by
Prentice Hall

ISBN 10:
0133186024

ISBN 13:
978-0-13318-602-4

The $17^{\text{th}}$ term is $18$.

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