exam Maths Puzzle Numerical Ability

Hi there! I am having terrible trouble trying to simplify this expression. Instructions say to simplify and express the answer using positive exponents.
[2x^(3/4)*y^(-1/2)]^(-8)

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exam Other Question

please help me to solve this equation: [(x-)1/1-(1/x)]/[(x+)1/1+(1/x)] it takes a painter A 3 hrs to paint a certain area of a hhouse.it takes painter B 5 hrs to do the same job.how long would it take them,working together,to do the painting job?