book Maths Puzzle Numerical Ability

I need to simplify the expression (2 to the square root of 27)x (3 to the square root of 32)? This is also a multiple choice A. 72 to the square root of 6 B.18 to the square root

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book Other Question

y^4 -81 Solve for the indicated variable:
2/w - y = z, solve for w

This is how I solved it, I'm I correct?
1/w = z + y/2

Thanks for your help