book Maths Puzzle Numerical Ability

I dont understand how to get the answers to 8^(5/3) and 27^(4/3)

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book Other Question

Which property is illustrated by each of the following statements?
9.2(1.5+2.3)= 9.2(1.5)+9.2(2.3) How do show square root of 3 on a number line using the pythagoras theorem?