Exercise 37 Page 32

To find the midpoint of two points, we need to know their coordinates. Because we have been asked about the midpoint of segment $\overline{FK},$ we only need to consider the coordinates of $F$ and $K.$

Now we can substitute these coordinates in the Midpoint Formula. Since this is a number line, we only need to consider the $x\text{-coordinate}$ portion of the formula. The midpoint of $\overline{FK}$ is $3.$