Year - Gas Price
2005 - $2.32
2006 - $2.63
2007 - $2.85
2008 - $3.32
2009 - $2.40
2010 - $2.84
2011 - $3.58
2012 - $3.70
2013 - $3.58
2014 - $3.43
2015 - $2.51

c. What equation models the data? What are the domain and range of the equation? Explain how you determined your answers.

d. Is there a trend in the data? Does there seem to be a positive correlation, a negative correlation, or neither?

How much do you expect gas to cost in 2020? Explain.