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October 25, 2014

October 25, 2014

Posted by **Jessica** on Tuesday, November 8, 2011 at 11:45am.

One demographer believes that the population growth of a certain country is best modeled by the function P (t) =15 e^.08t, while a second demographer believes that the population growth of that same country is best modeled by the function P (t) =15 +3t. In each case, t is the number of years from the present and P (t) is given in millions of people. For what values of t do these two models give the same population? In how many years is the population predicted by the exponential model twice as large as the population predicted by the linear model?

- algebra -
**Steve**, Tuesday, November 8, 2011 at 8:51pmJust get past the words and see what they're really telling you.

There are two functions:

p(t) = 15e^.08t

q(t) = 15 + 3t

when are they equal?

15e^.08t = 15+3t

p(0) = 15

q(0) = 15

p(1) = 16.249

q(1) = 18

They start out the same, but you know that the exponential will eventually grow much faster. Look at a graph.

p(t) = q(t) when t = 20.235 or so

when does

p(t) = 2q(t)

again, from the graph, t=34.501

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