At the beginning of this chapter, we presented a graph showing the price per gallon of gasoline from 1996 until 2015. The actual data for each year are given below.

Determine the trend line using both linear and nonlinear equations. Which would you suggest? Why? Based on your recommendation as the better equation, what cost per gallon would you estimate for 2016 and 2017?

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Year Cost/Gallon Year Cost/Gallon 2,57 1996 1.20 2006 1997 1.20 2007 2.80 2008 1998 1.03 3.25 1999 1.14 2009 2.35 2000 1.48 2010 2.78 2001 1.42 2011 3.52 2002 1.35 2012 3.62 2003 1.56 2013 3.49 2004 1.85 2014 3.34 2005 2.27 2015 2.40