exam Maths Puzzle Numerical Ability

You deposit $2000 in an account that pays 2% annual interest compounded quarterly. How long will it take for the balance to reach $2400?

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How do you start to solve this problem with simplify the expression?
x to the negative 3/7 power times x to the positive 5/3 power, all over x to the 4/5 power? Find the value of x in the domain of f(x)= 4 - 3x for which f(x) =7