Social Science The percentage of people 25 years old and older who have completed four or more years of college was 21.3% in 1990 and 28.0% in 2006.
(a) Find a linear equation that gives the percentage of people 25 and over who have completed four or more years of college in terms of time t, where t is the number of years since 1990. Assume that this equations remains valid in the future.
(b) What will the percentage be in 2012?
(c) When will 40% of those 25 and over have completed four or more years of college?
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