What is the midpoint of the segment between -4,9 and 28,-29?

\(\text{Given two points }p_1,~p_2, \text{ the midpoint of the segment joining them is given by}\\ m=\dfrac{p_1+p_2}{2} \\ \text{in this case }\\ m =\left( \dfrac{-4+28}{2},~\dfrac{9-29}{2}\right)=?\)

I leave that bit of arithmetic to you.

Continuing on, we have \(\frac{24}{2}, \frac{-20}{2}\). Thus, our answer is \((12,-10)\).