Philip P. answered 01/08/18
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Given two endpoints, (x1,y1) and (x2,y2), the midpoint is:
Midpoint = ( (x1+x2)/2, (y1+y2)/2 )
For this problem ((x1,y1) = (-3,9) and (x2,y2) = (5,3). Plug the numbers into the formula and compute the answer.