How many solutions do parallel lines have?

Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

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?