Write the equality and two conversion factors, and identify the numbers as exact or give the number of significant figures for each of the following:
a. A calcium supplement contains 630 mg of calcium per
tablet.
b. The Daily Value (DV) for vitamin C is 60 mg.
c. The label on a bottle reads 50 mg of atenolol per tablet.
d. A low-dose aspirin contains 81 mg of aspirin per tablet.
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