What are the coordinates of the midpoint of the segment whose endpoints are A(−1, 9) and B(3, 8) ? Answer in decimals

Midpoint formula: (x1+x2/2 , y1+y2/2)
So,  (-1+3/2  , 9+8/2)
-2/2 = -1      17/2 = 8.5
Answer: (-1,8.5)