If the endpoints of `bar(ab)` have the coordinates a(9, 8) and b(-1, -2), what is the midpoint of `bar(ab)`? a. (5, 3) b. (4, 5) c. (5, 5) d. (4, 3)

We have the segment shown in the Figure below. The midpoint of the line segment joining the points is given by the Midpoint Formula:

where:

Therefore, substituting these values in the midpoint formula we have:

So the right answer is D.

We simply use the midpoint formula to find the average values of the respective coordinates of the two endpoints.