Stacy hits the jackpot one day at the gumball machine. she puts in a quarter and gets 4 gumballs rather than 1. the radius of each gumball is 6 mm. what is the total volume of all 4 gumballs?

For this case, we can model the problem as the volume of a sphere.
 By definition, the volume of a sphere is:
 
 Where,
 r: radius of the sphere.
 Since we have 4 gumballs, then the total volume is:
 
 Substituting values we have:
 
 
 the total volume of all 4 gumballs is: