Posted by **Anonymous** on Thursday, November 15, 2012 at 2:45pm.

A population grows exponentially. If the population is 0.5sqrt(e) at one year and 0.5e at two years, what is it at 4 years?

- Math Calculus Help -
**Steve**, Thursday, November 15, 2012 at 3:57pm
we know that

p = ae^kt

using the known values,

√e/2 = ae^k

e/2 = ae^2k

divide to get

(e/2) / (√e/2) = e^k

√e = e^k

so, k = 1/2

now, we see that

√e/2 = ae^(1/2)

so a = 1/2

p(t) = 1/2 e^(t/2)

p(4) = 1/2 e^2

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