book Maths Puzzle Numerical Ability

V=3.14rsquared h solve for h

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Question:
Writing radial expressions in simplified radical form.
Simplify.
Square root of 7/square root of 18. this is written as a fraction.
Thank you I do not understand how to do this question. I tried making a chart and finding the slope, but it didn't help. e_e;;

Help on this problem would be greatly appreciated. Thank you