I really need help. Plz Help

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x

I’m stuck on this equation, anyone got the answer?

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?