exam Maths Puzzle Numerical Ability

I am having problems figuring out how to solve this problem:
The volume of a cube is given by V = s3. Find the length of a side of a cube if the Volume is 729 cm3.
Thanks!

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exam Other Question
I am lost on what to do with is the given data. The question is;
Determine the vertex of the parabla: y=(x+2)^2
What is the axis of symmetry?

I know the axis of symmetry is h but how do I find the h?

Thank you for your time Solve by using addition method. If no solution or infinite number of solutions,state so, and use set notation to express solution sets.

5x-2y=8
3x-5y=1