Question

A baseball has a diameter of 6 cm. If you wanted to replace the inside of the baseball with air, how much would be needed in cubic centimeters?

Answer 1

Its 70 centermeter becuase it is right

Answer 2

This is just another way of asking "what is the volume of a sphere of 6cm"
The volume of a sphere is $V= \frac{3}{4} \pi R^{3}$
The R is 3cm in this problem since the diameter is twice the radius. For a 3cm radius sphere this is 113.1cm^3