Can someone help me with this one I’m stuck please and thank you

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

Drag each tile to the correct box. not all tiles will be used. consider the recursively defined function below. create the first five terms of the sequence defined by the given function