Exercise 27 Page 24

Let's use the given information about the points on the number line to create a diagram so that it is easier to visualize the midpoint. Because we only know the length of AT, and not the specific location of T, there are two possibilities for its location.

To find the possible coordinates of the midpoint, we need to think about the halfway points between A and either T_1 or T_2.

The two possible midpoints are 3.5 and -3.5.