1) Midpoint of (3/5, -3) and (4, -6/7) is (23/10, -27/14)
2) Midpoint of (2/3, 5/2) and (4/5, 3/4) is (11/15, 13/6)
3) The other endpoint of the diameter is (-4, -4)
4) The points are vertices of square.
5) Distance of points (3/2, 5) and (5/6, -3)
(Please check my handwritten solution. Please keep it as guide for similar problems).