Last year, 400 signed up to take a virtual kickboxing class. This year, there was a 5% increase in registrations. How many people will take virtual kickboxing this year

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?