I need help!
Let $WXYZ$ be a trapezoid with bases $\overline{XY}$ and $\overline{WZ}$. In this trapezoid, $\angle ZXW = 90^\circ$, $\angle XWZ = 60^\circ$, and $\angle XYZ = 120^\circ$. Find $\angle XZW$, in degrees.
X Y
90 120
60
W Z
XZW will form a triangle
Angle ZXW = 90
Angle XWZ = 60
So XZW = 180 - 90 - 60 = 30
+1533 
