exam Maths Puzzle Numerical Ability

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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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exam Other Question

Could you please help me solve this prblem? It asks to simplify the following:
3x^-2
jack has $2.10 in nickles and quarter she has twice as many nickles as quater . how many of each does she have.