exam Maths Puzzle Numerical Ability

If k, n, x, and y are positive numbers satisfying x^-4/3 = k^-2 and y^4/3 = n^2, what is (xy)^-2/3 in terms of n and k?

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exam Other Question

Please help me solve the equation. -4(x-9)=-8.

Thanks for all of your help!
Place the following set of numbers in ascending order.
-2/5,1/6, 7/8, 5/9, 3/4