#### Answer

$(0,\frac{11}{2})$

#### Work Step by Step

We are given that the midpoint $M$ of a line segment $PQ$ with endpoints ($x_{1}$,$y_{1}$) and ($x_{2}$,$y_{2}$) is equal to:
$M=(\frac{x_{1}+x_{2}}{2},\frac{y_{1}+y_{2}}{2})$
Therefore, $M=(\frac{-9+9}{2},\frac{3+8}{2})=(\frac{0}{2},\frac{11}{2})=(0,\frac{11}{2})$.