1. Let A denote the set of all people living in Chicago. Let B denote the set of all
telephone numbers. Let f assign, to each person in A, their telephone number.
Is this a function? Explain in complete sentences.

2. Let A denote the set of all people who were alive in 2010. Let B denote the set of all real numbers. Let f assign, to each person in A, their weight during the year 2010. Is f a function? Explain in complete sentences.

3. Let A denote the set of all people (who are living or dead). Let B also denote the set of all people (who are living or dead). Let f assign, to each person in A, their biological mother. Is f a function? Explain in complete sentences.

4. You go for a walk from your house at 12:00 noon and return at 2:00. Let A denote the set of numbers between 0 and 2 (inclusive) and let B be the set of all real numbers.
The numbers in A will represent times after 12:00 in hours. Let f assign, to each number in A, the distance you were from home at that time. Is f a function? Explain in complete sentences.

5. You go for a walk from your house at 12:00 noon and return at 2:00. The farthest you walked from home was 3 miles. Let A denote the set of numbers between 0 and 3 (inclusive) and let B be the set of all numbers. The numbers in A will represent the distances you were from home during your walk. Let f assign, to each distance in A, the time when you were that distance from home. Is f a function? Explain in complete sentences.

6. Let A denote the set of all real numbers. Let B denote the same set as A. Let f be the function that, to each number in A assigns the square of the number. Is f a function? Explain in complete sentences.

7. Let A denote the set of all real numbers. Let B denote the same set as A. Let f be the function that, to each number x in A, assigns the number y with the property that y2 = x. Is f a function? Explain in complete sentences.

1. Let A denote the set of all people living in Chicago. Let B deno...