A baseball has a 45 cm diameter. what is the volume of the contents of the ball

First you need to find the radius. To do that you need to divide the diameter by two;

45 / 2 = 22.5

Then you plug the radius in the formula for a sphere. Which is ...

V = (4 / 3) πr^3

First you need to find the volume with out pi

V = (4/3) π (45) ^3

V = π (4/3) (91,125)

Your answer with out pi is ...

V = (68,343.75) π cm^3

And with pi is ...

V = 214,708.22 cm^3