The formula for the volume of a sphere is V = (4/3)πr³, where r is the radius of the sphere. Since we have the diameter of each gumball, we can find the radius by dividing the diameter by 2:
r = 8mm / 2 = 4mm
Now we can find the volume of one gumball:
V = (4/3)π(4mm)³ ≈ 268 mm³
To find the total volume of all 4 gumballs, we can simply multiply the volume of one gumball by 4:
Total volume = 4 x 268 mm³ = 1072 mm³
Therefore, the total volume of all 4 gumballs is approximately 1072 cubic millimeters.