Find the Missing Coordinate

Question 1:

A is the coordinate (-3,-10). If the midpoint of A and B is (-5.5,-4.5), find B.
(-8,1)

Question 2:

A is the coordinate (-5,-3) and B is (-1,-7), find the midpoint.
(-3,-5)

Question 3:

A is the coordinate (-8,-1). If the midpoint of A and B is (-5.5,2), find B.
(-3,5)

Question 4:

A is the coordinate (9,-8) and B is (-7,-1), find the midpoint.
(1,-4.5)

Question 5:

A is the coordinate (-7,2). If the midpoint of A and B is (-8,-1), find B.
(-9,-4)

Question 6:

A is the coordinate (9,-5) and B is (-9,-2), find the midpoint.
(0,-3.5)