Did I do it right? Please help ASAP!

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?

Evaluate 8j -k+148j−k+14 when j=0.25j=0.25 and k=1k=1.

Yvaries inversely as x. y =12 when x=5. find y when x=4