To solve this you need to use the midpoint formula ,which is (x1,y1) (x2,y2) and substitute in the given coordinates within the given/known formula : (x2+x1/2 , y2+y1/2)
x1,y1 =(-3,-6) , x2,y2 =(2,5)
=(2-3/2),(5-6/2)
This will give you a final (midpoint) answer(s) of (-1/2.-1/2)