Someone help it would be greatly appreciated

The amount of money, in dollars, in an account after t years is given by a = 1000(1.03)^t. the initial deposit into the account was $_^a0 and the interest rate was _a1% per year. only enter numbers in the boxes. do not include any commas or decimal points^t. the initial deposit into the account was $__^a0 and the interest rate is % per year.

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Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)