HELPP
Find the value of x.
can someone tell me what anwser it is.

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?

The circumference of a circle is 5 pi cm. what is the area of the circle?

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11