Due in 30 minutes. Help please!

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?

How do you determine whether a relationship represented as as graph is linear or nonlinear

Which table represents points on the graph of h(x) = 3√-x+2?