Philip P. answered • 11/28/16

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N(t) = 211e

^{0.0109t}For 1980, t=0 and N(t) = 211. This is the population in 1980. We want to know when the population will be twice as big, so we want N(t) = 2*211. Let's plug that into the population equation and solve for t:

2*211 = 211e

^{0.0109t}2 = e

^{0.0109t}ln(2) = 0.0109t

ln(2)/0.0109 = t

Use your calculator to compute the answer.

James S.

11/28/16