Answer
$5$, $(-6,\frac{11}{2})$
Work Step by Step
1. Given $A(-6,3), B(-6,8)$, use a formula, we can find
the distance between the pair of points as
$d=\sqrt {(-6+6)^2+(8-3)^2}=5$
2. We can find the midpoint
of the line segment as
$(\frac{-6-6}{2},\frac{3+8}{2})$.or $(-6,\frac{11}{2})$
