exam Maths Puzzle Numerical Ability

Suppose at age 16 you decided to invest $5.00 in a fund that pays 8% interest compounded annually. How much money will have accrued in the fund when you retire at age 65?

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exam Other Question

Find a in terms of b, given that
log4(a b2) = 3
Note that, in validating your answer, Maple may display your answer in a slightly different (but nevertheless equivalent) form to what you might expect. the difference between two times the square of a number and five times the number is 75. What is the number?