Find an equation giving the percentage of college students age 35 and older in terms of t where t represents the number of years since 1972
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1998-1972=26 years, and 17%-9%=8%.

So the rate of percentage increase is 8/26=4/13% per year.

A linear function might look like f(t)=9+4t/13 percent for years since 1972.

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