What is the value of z in 5z=80z*-1/3

An astronaut drops a rock into a crater on the moon. the distance, d(t), in meters, the rock travels after t seconds can be modeled by the function d(t)0.82. what is the average speed, in meters per second, of the rock between 5 and 10 seconds after it was dropped?

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

Evaluate cos2θ for cosθ = square root of 3/2