exam Maths Puzzle Numerical Ability

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Find the dimensions of a rectangle "a" with the greatest area whose perimeter is 30 feet.

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exam Other Question

Maria deposited $1200 in an account that paid 6 and 1/2 percent interest compounded continuously. How much money did she have in 8 years? (A, = Pe^rt) What is the future value of a 5 year annunity due that promiese to pay you $300 each year? Assume that all payments are reinvested at 7 Percent a year, until Year 5.

Please simply answer for me, I have a hard time with math, pleae show formula.