Area and lenth formula with pie

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.

If you are just building your payment history, how many points from a perfect score will you possibly miss?

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?