book Maths Puzzle Numerical Ability

Hello, I could really use your help with this question.

What is the expression for the height of a cone in terms of its radius and volume?

Thanks, Amanda

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book Other Question

-3x2 +x -2 =0

I only need to solve this in QF and don't need to find the discriminant.
I have problem with this question:
Find the value of sin4A