Can somebody please help it's from khan academy and I have been working on it for 30 minutes now​

The volume of a cone is 37x3 cubic units and its height is x units. which expression represents the radius of the cone's base, in units? 1 s o 3x o 6x obx 93x2

Asap! i'm not good math and i'm lost.

Solve the equation for b: a= (1/2)(b)(h)