exam Maths Puzzle Numerical Ability

Could you please help me solve this prblem? It asks to simplify the following:
3x^-2

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exam Other Question

A 2000L tank containing 550L of water is being filled with water at the rate of 75L per minute from a full 1600L tank. How long will it be before the two tanks have the same amount of water? QUICK!
Could someone help me with this question.

If {{{log(2X)/log(x-4)=2}}} Determine all possible values of x correct to the nearest tenth, where necessary.

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