If 4 gallons of gas cost $14, how much does 1 gallon of gas cost?

Which of the following properties can be used to show

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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?