Please help asap thanks in advance.

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

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′?