exam Maths Puzzle Numerical Ability

I dont have any clue as to what i need to do for this problem.
(x^3*x^4/x^2)^6

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exam Other Question

The formula A=6V^2/3 gives the surface area of a cude in terms on its colume V. What is the volume of a cube with surface area of 12 square feet?

I come up with, 12=6(1)^2/3 So the colume is 1.
Am I correct? You clocked the time between lightning and thunder as 8 seconds. About how far away was the lightning?