Answer
$\dfrac{7}{10}$
Work Step by Step
The $16^{\text{th}}$ term is $\dfrac{1}{5}$ and the common difference is $\dfrac{1}{2}$ so we simply add $\dfrac{1}{2}$ to $\frac{1}{5}$ to get the $17^{\text{th}}$ term:
$a_{17}=a_{16}+ d$
$a_{17}=\dfrac{1}{5} +\dfrac{1}{2}$
$a_{17}=\dfrac{2}{10} +\dfrac{5}{10}$
$a_{17}=\dfrac{7}{10}$