exam Maths Puzzle Numerical Ability

please help me answer this problem
n+9
_
n^2

times

6n^2
_
n^2-8

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exam Other Question

Find the surface-area-to-volume ratio for a rectangular prism with edge lengths 9,6,and 7. I am having a problem solving this problem:

Is the square root of x^2 =x an identity (true for all values of x)?
Thanks for your time.