Idon't know how to get to x. this is what i have so far.

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?

An internet company charges $8.95 per month for the first 3 months that it hosts your web site. then the company charges $11.95 per month for web hosting. how much money, in dollars, will the company charge for 8 months of web hosting?

How can constraints be used to model a real-world situation?