Simplify each expression (4r^3+-5r^3)

Use the graph of the sine function y=2sinθ shown below

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′?

What is the angle measure, or angle of depression, between this bird and the bird watcher?