Ask a question
0 0

solve population growth

Under ideal conditions, a population of rabbits has an exponential growth rate of 11.7% per day. Consider an initial population of 100 rabbits.
(a) Find the exponential growth function
(b) What will the population be after one week? After 2 weeks?
(c) Find the doubling time.
Tutors, please sign in to answer this question.

2 Answers

P = P0ekt
In this case
(a) P = (100)e(0.117)(t)
(b) P = (100)e(0.117)(7 days)
     P = 226.8
(c) 200 = (100)e(0.117)t
     e(0.117)(t) = 2
      (0.117)(t) = ln(2)
     t = 5.92 days
Start by noting the variables:
Where k is the growth rate (in decimals) and t is the time (in days)  A is the original amount or initial population, and A(t) represents the population at time t.
The growth function is:
The population at time t=1 week (7 days) and t=2 weeks (14 days)
For 1 week, t=7
A(7)=100e.117*7=226.8 or 226
For 2 weeks, t=14
A(14)=100e.117*14=514.4 or 514
Finally the doubling time is:
So 2=e.117t
take the ln of both sides:
t=ln(2)/.117= 5.92 days, or 6 days.