Challenge A spherical balloon has a ​-in. diameter when it is fully inflated. Half of the air is let out of the balloon. Assume that the balloon remains a sphere.
a. Find the volume of the​ fully-inflated balloon.
b. Find the volume of the​ half-inflated balloon.
c. What is the radius of the​ half-inflated balloon?
Question content area bottom
Part 1
a. The volume of the​ fully-inflated balloon is enter your response here
​(Simplify your answer. Type an exact​ answer, using pi as needed. Use integers or fractions for any numbers in the​ expression.)
Part 2
b. The volume of the​ half-inflated balloon is enter your response here
​(Simplify your answer. Type an exact​ answer, using pi as needed. Use integers or fractions for any numbers in the​ expression.)
Part 3
c. The radius of the​ half-inflated balloon is about enter your response here in.
​(Round to the nearest whole number as​ needed.)