book Maths Puzzle Numerical Ability

How can I solve the following problem?

7*root3(48x^4y^8) / root(3,6y^2)

Please explain law of exponents>

Thank you in advance,

Ivelisse

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book Other Question
I am totally lost on this. Please help!

Write the first 5 terms of the sequence a(n)=n^2+1

Thanks in advance graph the function & state the domain & range.

28. y=sqrtx-2