Zimride is a website where people at least 18 years old can offer and get paid for shared car rides. The numbers of users of the site are shown in Table 69 for various years.

Let y be the number (in thousands) of users of Zimride at x years since 2000.
a. Construct a scatterplot.
b. Use two points to find an equation of a model. Graph the model on the scatterplot.
c. Describe the four characteristics of the association.
d. What is the base b of the model y = abx? What does it mean in this situation?
e. What is the coefficient a of the model = abx? What does it mean in this situation?

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Table 69 Numbers of Users of Zimride Year Number of Users (thousands) 2007 2008 2009 2010 2011 2012 10 35 105 200 400