exam Maths Puzzle Numerical Ability

The volume of a cube is given by 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

Find values for m and b in the following system so that the solution to the system is (-3,4)

5x+7y=b
mx+y=22
I need some help with simplifying the following:

1/2y^2 + 6/8y^3

I come up with the following answer:

1/2y^2 + 3/256

Is this correct?