exam Maths Puzzle Numerical Ability

I am having trouble solving equations with logs this is the problem i am stuck on...

log x=4.5

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exam Other Question

(27x3y4)-3 Please show me how to get the answer, this was a multiple choice question I had for homework?

-64^2/3

A.) 16 B.) -16 C.)1/16 D.) -1/16