exam Maths Puzzle Numerical Ability

Please help me figure this out - step-by-step.

4y^-1/2 = 16

Thanks.

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exam Other Question

-4/6z + 2=30, I need to help my son write this out and be able to explain the steps to him. thanks in advance for the help 21 solve for x:2x/5=12-3x/2