exam Maths Puzzle Numerical Ability

Hello, I need to simplify the expression: {54b^4x^4/16bx^2}^1/3. Thank you!

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/could you please explain the steps to simplify expressions. We have not received our books, yet.
equation:
(m + 11) + 19

Thank you, very much. Assume that y varies inversely as x. If y = 3.2 when x =0.2, find y when x =1.6