Hi

Population formulas, where x is the number of years beyond 1998

16.7e^0.0015x = 14.6e^0.0135x

 16.7/14.6 = e^(.0135x-.0015x) = e^.012x

 ln(16.7/14.6)/.012 = x

            x = 11 years (to the nearest year)

 1998 + 11  = 2009, the year the populations will be equal. 

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