1. 1. In 1988 a public library had 16,000 books on its shelves. In 1992 the library had 19,000 books. A) Find the average rate of change in the number of books per year. B) How many books did the library have when it opened in 1980? C) Write an expression representing the number of books in the library since it opened. D) How many books would the library have today?

2. 2. At Memorial Hospital there were 600 births in 1999. In 2001 There were 550 births. A) Find the average rate of change in the number of births per year. B) How many births were there the year the hospital opened in 1995? C) Write an expression representing the number of births each year since it opened. D) At this rate in which year will the last baby be born at this hospital?

3. 3.A movie rental plan requires a membership fee and charges a certain amount for each movie rented. The plan costs you a total $22 to rent 4 movies and $37 to rent 9 movies. A) Find the cost the plan charges to rent each movie. B) Find the membership fee charged by the plan. C) Write an expression to represent the cost of renting any number of movies. D) What is the cost of renting 18 movies?

4. 4. Arthur decides to train for a road race, during the 3 rd week of training he ran 4.5 miles. During the 6 th week he ran 6.75 miles. A) Find the rate of change in the number of mile run each week. B) How many miles did he run the first week? C) Write an expression to represent the number of miles run in week w. D) How many mile would he have ran during the 10 th week of training?

5. 5. In 1990 the average cost per unit of computer memory was $10, in 2000 that same unit of memory cost $0.50. A) Find the average rate of change in the cost of a unit of memory. B) What would have been the cost of a unit for one of the first computers in 1980? C) Write an expression representing the cost of unit of memory for any year since 1980. D) What would be the expected cost in 2010? E) Does this make sense? Why?

6. 6. You are flying to Dallas from Seattle. After one hour your distance from Dallas is 1720 miles, after 3 hrs. you are 860 miles from Dallas. A) At what rate is the distance to Dallas changing? B) What is the distance between Seattle and Dallas? C) Write an expression representing the distance from Dallas in terms of time flying. D) How many hours will the flight to Dallas last?