In this problem you are asked to convert radians to degrees.
$\pi\hbox{rad} =$ ${}^\circ.$
$1.5\hbox{rad} =$ ${}^\circ.$
$-4\pi\hbox{rad} =$ ${}^\circ.$
Hint: Everything follows from the fact that $$360^\circ = 2\pi \hbox{~rad}.$$