Answer
$a_{11}=-\dfrac{4}{3}$
Work Step by Step
Using $a_n=a_1+(n-1)d$ or the $n$th term of an arithmetic sequence, then,
\begin{array}{l}
a_{11}=2+(11-1)\left( -\dfrac{1}{3} \right)
\\\\
a_{11}=2-\dfrac{10}{3}
\\\\
a_{11}=\dfrac{6-10}{3}
\\\\
a_{11}=\dfrac{-4}{3}
\\\\
a_{11}=-\dfrac{4}{3}
.\end{array}