Answer
The $17^{\text{th}}$ term is $23$.
Work Step by Step
The $16^{\text{th}}$ term is $18$ and the common difference is $5$ so we simply add $5$ to $18$ to get the $17^{\text{th}}$ term:
$a_{17}=a_{16}+d\\
a_{17}=18+5\\
a_{17}=23$
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