Problem

Social Science The percentage of people 25 years old and older who have completed four or...

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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