Question

1) Which of the following are functions of x?

(a) The area of a circle with radius x.

(b) The value of y if y⁴=2x³.

(c) The temperature in Chicago on January 1st, 2007, x hours after midnight where x is between 0 and 12. [Hint: Which part of Chicago are we talking about? Is the temperature the same everywhere in Chicago?]

(d) The price of an x ounce container of cottage cheese in Los Angeles on February 1st 2006.

(e) The tuition a student ends up paying if he or she goes to college x in a specific year.

(f) The birth date of a person x.

(g) The profit you make from selling x wazoos, where each wazoo sells for 10 cents and costs 5 cents to make, including all cost of production.

Answer 1