How many cubic inches of material do you need to make a solid rubber ball with diameter
of 3

Step-by-step explanation:

What we're looking for here is the volume of this ball, which is the volume of a sphere:

If our diameter is 3, then the radius is 1.5:

In terms of π, the solution is

which can also be expressed as

Or if you have to multiply in the pi, the solution is

V = 14.14 cubic inches

What is asked in the problem is simply the volume of the solid rubber ball.

Step-By-Step:

The volume of sphere given the diameter may be calculated by,

                              V = πd^3 / 6

Substituting the given value of diameter, 

                              V = (π x 3³) / 6 = 9π/2 or 14.14

Nonetheless, one needs approximately 14.14 in³ of material.