Pearson Geometry Common Core, 2011
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Pearson Geometry Common Core, 2011 View details
7. Midpoint and Distance in the Coordinate Plane
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Exercise 62 Page 56

Use the Midpoint Formula.

D

Practice makes perfect
To find the midpoint, we can use the Midpoint Formula. M(x_1+x_2/2,y_1+y_2/2)The coordinates of the given endpoints are (14,-8) and (4,12). Let's use these to find the coordinates of the midpoint.
M(x_1+x_2/2,y_1+y_2/2)
M(14+ 4/2,-8+ 12/2)
M(18/2,4/2)
M(9,2)
The midpoint is located at (9,2), so answer D is correct.