exam Maths Puzzle Numerical Ability

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?

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factor each trinomial

49z^2-42z+9 the answer is (7z-3)^2 how in the world do they come up with that? You deposit $2000 in an account that pays 2% annual interest compounded quarterly. How long will it take for the balance to reach $2400?