Answer:
The answer is below
Step-by-step explanation:
The distance between two points is given by the formula:

1) (-4,6) and (3, -7)

2) (-6, -5) and (2,0)

3) (0, -8) and (3, 2)

4) (-1, 4) and (1, -1)

The midpoint (x, y) between two endpoints is given by:

The midpoints of the following segments are:
1) (15, 8) and (-1, -4)

2) M(-5,9) and N[-2.7)

3) P(-3,-7) and Q13.-5)

4) F(12.-6) and G(-8,5)

First,
(x•1)+(x/1) = x+x
Then,
x+x=2x