Find the Missing Coordinate

Question 1:

A is the coordinate (-7,-4). If the midpoint of A and B is (-5.5,-4), find B.
(-4,-4)

Question 2:

A is the coordinate (-3,-7) and B is (7,8), find the midpoint.
(2,0.5)

Question 3:

A is the coordinate (-3,-4). If the midpoint of A and B is (-5.5,-7), find B.
(-8,-10)

Question 4:

A is the coordinate (-4,4). If the midpoint of A and B is (-5.5,-2.5), find B.
(-7,-9)

Question 5:

A is the coordinate (-2,10) and B is (-6,-10), find the midpoint.
(-4,0)

Question 6:

A is the coordinate (2,0). If the midpoint of A and B is (-2.5,-5), find B.
(-7,-10)