Can someone please help me

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?

Which function has the same domain as y=2x

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane