GEOMETRY HELP NEEDED!! find the value of x

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?

Assume that y varies inversely with x. if y=1.6 when x=0.5 find x when y=3.2 acellus answer

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale