book Maths Puzzle Numerical Ability

Side of a cube.

Find the length of the side of a cubeic box whose volume is 80 cubic feet.

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book Other Question

determine the GCF
9(x-7)^6, 12(x-7)^9, 3(x-7)^10

I got the answer 3(x-7)^6 Is this right?

thank you The current in a river is 5km per hour downstream. A motorboat can go downstream a distance X miles in one third the time it takes to come back up the same distance. what is the sp