Answer:
Explanation:
Volume of a sphere:
V = 4/3 x pi x r^3
5. 3053.63mm^3
18 / 2 = 9mm = radius
4/3 x pi x 9^3 = 3053.628
8. 11494.04mm^3
28 / 2 = 14mm
4/3 x pi x 14^3 = 11494.040
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