exam Maths Puzzle Numerical Ability

I need to know how to find the volume of a cube. The question states. The volume of a cube is given V=s^3. Find the length of a side of a cube if the Volume is 729cm^3.

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exam Other Question

2 planes leave Newyork AT 10am, one heading for Europe at 600mph and one heading in the opposite direction at 150mph. At what time will they be 900 miles apart? Solve the equation: (4^2-x)(16^x+1)=64

FYI - The 2-x and x+1 the exponents.