Economics In Exercises 19–22, use the line graph, which shows the average prices of a gallon of premium unleaded gasoline from 2005 through XXXXXXXXXXSource: U.S. Energy Information Administration)  ...

Economics In Exercises 19–22, use the line graph, which shows the average prices of a gallon of premium unleaded gasoline from 2005 through 2013. (Source: U.S. Energy Information Administration)

19. Describe the trend in the price of premium unleaded gasoline from 2005 to 2008. 20. Describe the trend in the price of premium unleaded gasoline from 2008 to 2009. 21. Approximate the percent decrease in the price per gallon of premium unleaded gasoline from 2008 to 2010. 22. Approximate the percent increase in the price per gallon of premium unleaded gasoline from 2009 to 2013.