Linear Model Quiz:

The table below shows the total miles (in billions) driven by trucks in the U.S. by year. Use the data to make a linear model and answer the questions.

Data Table:

Year	Miles Driven
1970	186
1975	282
1980	399
1985	500
1987	552

Your Name:

1. What is the slope of the line of best fit? (Include units)

2. What does the slope mean in terms of the variables?

3. Write an equation for the function. Be sure to define your variables.

4. Which is the independent variable?

5. Which is the dependent variable?

6. If the trend continues, predict how many miles were driven in the year 1996?

7. If the trend continues, when will the number of miles driven be 1 trillion?

8. Name three factors that might affect your model and give the results of each.

9. If the number of trucks is 12 % of the number of cars, write an equation for how many total miles are driven by all U.S. cars each year.

10. If cars produce .816 lb of carbon dioxide for each mile driven, how much carbon dioxide is produced by U.S. cars in one year?