Hey please help thanks

For which pair of functions is (gof)(a)=|a|-2?

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.