Mark and his 3 friends went for dinner and their total bill was $85.90. They added 10% tip to the bill. Sales tax is 8%. How much did each person pay

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.

What is the answer to the question 5x+2x

At noon a tank contained 10cm water. after several hours it contained 7cm of water. what is the percent decrease of water in the tank?