Addison has a reading assignment to complete. The number of pages he has left to read d days after being given the assignment can be modeled by the equation n = 252 - 47d, where n is the number of pages left to read. What is the meaning of 252 in the equation? A) Addison reads 252 pages per day. B) Addison reads 252 pages per hour. C) Addison's book contains 252 pages. D) Addison will complete the book in 252 days.