I NEED HELP ASAP PLEASE!! The teacher didn't and won't explain how to do this so i am stuck!
I have limited time so please!

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 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take