Answer each part. If necessary, round your answers to the nearest hundredth. (a) At Garcia's Bike Rentals, it costs $21 to rent a bike for 4 hours.
How many hours of bike use does a customer get per dollar?
30 hours per dollar
(b) Lashonda bought 18 pounds of rice for $9.
How many pounds of rice did she get per dollar?
30. pounds per dollar

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.

Can someone me out here number 4 plz

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?