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The formula for the volume of a sphere is V = (4/3) * pi * R^3.
Substitute R = 7.3 mm and pi = 3.14 into the formula:
V = (4/3) * 3.14 * (7.3)^3
V = (4/3) * 3.14 * 389.017
V = 12.56 * 389.017
V = 4895.15 mm^3
Rounded to the nearest tenth, the sphere's volume is 4895.2 mm^3.