book Maths Puzzle Numerical Ability

Please help with this problem. (4x)^3(8x^-5)
I know that the ^3 means to multiply 4x times 4x times 4x.
In the second part, I believe the 8 does not get multiplied by the ^-5, o

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book Other Question

for a rectangular object if the lenght is 15 inches on one side and n inches on another and the height is 8 inches then what is the surface area and volume? please help: x^2+5x-14