The volume of a cylinder is 4πx3 cubic units and its height is x units.Which expression represents the radius of the cylinder, in units?

Use the cylinder volume formula, V = πr²h. Substituting V = 4πx³ and h = x gives 4πx³ = πr²x; dividing by πx gives r² = 4x², so the radius is 2x units. Choice A, 2x, is correct.

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