Help me pls gemotry math question

Which expression is equivalent to (9x - 3 1/ + 1 3/8)

If rt is greater than ba, which statement must be true ?

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?