
Concept explainers
(a)
To calculate: The formula for
(b)
To calculate: The percentage of Americans completing four years of college or more by 2019 according to the general term computed in the part (a), where n years after 1969, where the values of percentages for the year 1970 and 2007 is shown in the graph and the percentage increases 0.5 per year from 1970.
The graph is as follows:

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