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Determine whether each rule of correspondence represents a function, and explain your answer. If the rule is a function, state its domain.
(a) to each student enrolled in this class, we assign their phone number.
(b) To each person in your household, we assign that persons age in years.
(c) to each state, we assign the number of representatives the state has in the U.S. House of Representatives.
(d) At a used CD/DVD store, to each title in stock we assign the titles price.
