Hey there! I'm happy to help!
For the x value of the midpoint, you add the x values and divide by 2. For the y value of the midpoint, you add the y values and divide by 2.
First we add the x values.
-4+10=6
And divide by 2.
6/2=3
Then we add the y values.
3+7=10
And divide by 2.
10/2=5
Therefore, our midpoint is (3,5).
Have a wonderful day! :D