Answer
3.6 units
Work Step by Step
Use the distance formula to find AB.
$d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$
$d=\sqrt{(-2-4)^2+(3-(-1))^2}$
$d=\sqrt{(-6)^2+(4)^2}$
$d=\sqrt{(36+16}$
$d=\sqrt{52}$
$d=7.2$
The distance from the midpoint is half the distance from A to B.
$MB=\frac{AB}{2}=\frac{7.2}{2}=3.6$