The volume of a cone is 3 x cubic units and its height is x units.
which expression represents the radius of the cone's base, in units?
3x
0 6x
34x2
gax?

The  complete questions says:

The volume of a cone is cubic units and its height is x units.

Which expression represents the radius of the cone's base, in units?

3x

Step-by-step explanation:

The volume of a cone is given by:

where

r is the radius of the base

h is the heigth of the cone

In this problem, we know:

The volume of the cone:

(1)

And its height:

(2)

We can re-arrange the formula above to make r, the radius, the subject:

And by substituting (1) and (2), we find the radius:

step-by-step explanation:

you can use a^2+ b^2=c^2