Question

describe a function whose domain is the set of people in your town.
choose the correct answer below.
a. input: a person in your town. output: a pet they own.
b. input: a person in your town. output: their age.
c. input: a house in your town. output: a person who lives there.
d. input: your town. output: the number of people in your town.

Explanation:

A function requires each input to map to exactly one output. Option A fails because a person may own multiple pets or none, so it's not a single unique output. Option C uses houses (not people) as input, which doesn't match the required domain of people in the town. Option D uses the town as input, not individual people. Option B works because each person in the town has exactly one unique age, satisfying the definition of a function with the correct domain.

Answer:

B. Input: a person in your town. Output: their age