The volume of a cone is 3πx3 cubic units and its height is x units.Which expression represents the radius of the cone’s base, in units?

Use the cone volume formula, V = (1/3)πr²h. Substituting V = 3πx³ and h = x gives 3πx³ = (1/3)πr²x, so r² = 9x². Since a radius is positive, r = 3x, which is choice A.

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