
Philip P. answered 11/28/16
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N(t) = 211e0.0109t
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 = 211e0.0109t
2 = e0.0109t
ln(2) = 0.0109t
ln(2)/0.0109 = t
Use your calculator to compute the answer.
James S.
11/28/16