Answer
Midpoint = $(3,3)$
This matches the middle entry in the table.
Work Step by Step
To find the midpoint between points $(x_1,y_1)$ and $(x_2,y_2)$, we use the midpoint formula:
$\displaystyle Midpoint=(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})$
Using points $(0,-6)$ and $(6,12)$, we get:
$Midpoint=(\displaystyle \frac{0+6}{2},\frac{-6+12}{2})$
=$(6/2,6/2)$
=$(3,3)$
The middle entry in the table is $(3,3)$, the same as the midpoint (as we would expect).