Answer: (-4,8)
Step-by-step explanation:
[tex]\left(\frac{x_2+x_1}{2},\:\:\frac{y_2+y_1}{2}\right)[/tex]
Plug in the values then divide, I assume you know how to divide.
Divide by 2, Simplify
[tex]\left(\frac{-10+2}{2},\:\frac{12+4}{2}\right)[/tex]
= (-4,8)