These graphs represent a function modeling the amount of a harmful chemical in drinking water in parts per billion over time in years.

1. Here is Graph A with rectangles approximating the graphing windows of B, C, and D superimposed. Which rectangle matches which graph?

   

   Horizontal axis, time in years, 0 to 80, by 20’s. Vertical axis, amount of chemicals in parts per billion. Rectangles 1,2,3 graphed. Rectangle 2, starts at origin, base = about 10, height = about 30. Rectangle 3, starts at origin, base = about 80, height = about 10. Rectangle 1, starts at about 0 comma 65, base = about 10, height = about 30. 

2. Use graphing technology to create a graph of . Practice adjusting the graphing window so your graph looks like A, B, C, and D.
3. Imagine you are a public health official worried about this model, and you want to convince others that they should be worried, too. Which graphing window would you use, and why?
4. Imagine you are a public relations official for the company responsible for the chemical in the drinking water, and you want to convince others not to worry. Which graphing window would you use, and why?
5. What questions should a journalist writing about the issue ask each person about their graph, and which graph should she publish with the article?

Suppose represents the cost of renting a car  as a function of miles driven . Here’s a graph representing the function.

1. What is the graphing window used for the given graph?
2. Find a graphing window so that:
   1. The graph gives the impression that the charge per mile driven is very high, and the total rental cost gets really expensive really fast.
   2. The graph gives the impression that the charge for every mile driven is close to nothing and the total rental cost will be pretty low even if the car is driven many miles.