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. The Daily Value (DV) for iodine is 150 mcg.
b. The nitrate level in well water was 32 ppm.
c. Gold jewelry contains 58% gold by mass.
d. The price of a liter of milk is $1.65.
e. A metric ton is 1000 kg.
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