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big ideas math

Brainlest answer can you find the area and circumference of a circle given the radius or diameter? if its yes or no explain why

What is the y intercept of f(x)=(1/2)^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′?