A gigantic balloon used for a parade is shaped like an ice cream cone. The radius of the cone and the hemisphere is 12 feet. The height of the cone is 60 feet. If the balloon is filled with helium, how much helium will be needed to fill the balloon? Use 3.14 for pi.
The volume of the cone is (1/3)(pi)(r^2)(h)=(1/3)(3.14)(12^2)(60)=30,144
The volume of the hemisphere is 2/3*3.14*r^3=2/3(3.14)(12^3)=9,055.04
So the volume of helium needed to fill the balloon is 30,144+9,055.04=<<30144+9055.04=39199.04>>39,199.04 cubic feet of helium. Answer: \boxed{39,199.04}.