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. One liter is 1.057 qt.
b. At the store, oranges are $1.29 per lb.
c. There are 7 days in 1 week.
d. One deciliter contains 100 mL.
e. An 18-carat gold ring contains 75% gold by mass.
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