40% of what number is 74?

For how answer my question this will be the last question can you answer in math subject

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?

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319