Chapter 1 - Tools of Geometry - 1-7 Midpoint and Distance in the Coordinate Plane - Practice and Problem-Solving Exercises - Page 54: 15

$(3\frac{7}{8},-3)$

Use the midpoint formula. Substitute the given values. $M=(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})=(\frac{5\frac{1}{2}+2\frac{1}{4}}{2},\frac{-4\frac{3}{4}+(-1\frac{1}{4})}{2})=(\frac{7\frac{3}{4}}{2},\frac{-6}{2})=(3\frac{7}{8},-3)$