Figure 15 gives the percent of persons 25 years and over who have completed four or more years of college.
(a) Obtain the least-squares line that fits these data. (Let x = 0 correspond to 1989.)
(b) Estimate the percent for the year 2012.
(c) If the trend determined by the straight line in part (a) continues, when will the percent reach 35?

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35% 32.0 29.5 30% 27.7- 25.2 25% 22.2 21.1 20% 15% 10% 0% 1989 1994 1999 2004 2009 2014