Question

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Answer 1

Rationalizing means getting rid of the roots in the denominator.
To get rid of the root, you multiply both numerator and denominator by sqrt(30):
\[\frac{4\sqrt6}{\sqrt{30}}\cdot \frac{\sqrt{30}}{\sqrt{30}}=\frac{4\sqrt{6}\sqrt{30}}{30}\]
I trust you know how to proceed from here?

Answer 2

No problem. :)