How can you write an equation in two variables?

How can we find the measure of an exterior angle if we know the measurement of an interior angle

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?