Find the Missing Coordinate

Question 1:

A is the coordinate (4,-7). If the midpoint of A and B is (7,-7.5), find B.
(10,-8)

Question 2:

A is the coordinate (-1,1). If the midpoint of A and B is (4.5,-0.5), find B.
(10,-2)

Question 3:

A is the coordinate (10,-5) and B is (-2,-8), find the midpoint.
(4,-6.5)

Question 4:

A is the coordinate (-1,-3). If the midpoint of A and B is (1.5,0.5), find B.
(4,4)

Question 5:

A is the coordinate (-9,9) and B is (-3,2), find the midpoint.
(-6,5.5)

Question 6:

A is the coordinate (-9,-8) and B is (-2,4), find the midpoint.
(-5.5,-2)