PLEASE HELP DUE AT THE END OF CLASS

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 a || b and e || f , what if the value of y ?

An elevator travels 310 feet in 10 seconds. at that speed, how far can't his elevator travel in 12 seconds?