The following graph, which tracks the percentage of the female population of the United St...

The following graph, which tracks the percentage of the female population of the United States who smoke cigarettes, appeared in a report from the Centers for Disease Control and Prevention.

(a) What is the general trend for female high school seniors? What is the general trend for females 65 years and over?

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(b) Let x = 0 correspond to the year 2000. Approximate a linear function for female high school seniors using the points (0, 30) and (10, 16).

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(c) If the trend continues, estimate the percentage of female high school seniors who smoke cigarettes in 2012.