The percentage of college freshmen who smoke-declined substantially from the year 2004 to the year 2014. Figure 14 shows the percentage of college freshmen who smoked during six of the years of that time period and the least-squares line for the data, where x represents the number of years after 2004.
(a) Obtain the least-squares line that fits the data.
(b) Use the equation to determine the percentage of the 2009 freshmen class who smoked.
(c) According to the least-squares line, in what year did approximately 4.9% of college freshmen smoke?

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