Differential Equations Problem, logistic models

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SUMMARY

The discussion focuses on solving a differential equation representing a logistic model for population growth, specifically dP/dt = 0.3 P (3.5 - P/40) with an initial condition of P(0) = 30. The solution involves using the logistic growth formula P(t) = P0 P1 /(P0 + (P1 - P0)e^(-AP1 t)). Participants confirm that the correct approach has been taken for part a) and suggest calculating the constants k1 and k3 to proceed with part b), which requires finding the population after 2.5 months and the limit of P(t) as t approaches infinity.

PREREQUISITES
  • Understanding of differential equations, specifically logistic models
  • Familiarity with the logistic growth formula P(t) = P0 P1 /(P0 + (P1 - P0)e^(-AP1 t))
  • Knowledge of initial value problems in calculus
  • Ability to compute limits in mathematical functions
NEXT STEPS
  • Calculate the constants k1 and k3 based on the given logistic model parameters
  • Determine the population P after 2.5 months using the derived formula
  • Evaluate the limit of P(t) as t approaches infinity to understand long-term population behavior
  • Explore additional applications of logistic models in population dynamics
USEFUL FOR

Students studying calculus, particularly those focusing on differential equations and logistic models, as well as educators looking for examples of population modeling techniques.

beccajd
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Homework Statement



Given that a population, P, after t months, can be modeled by the logistic model
dP/dt = .3 P (3.5 - P/40).
P(0) = 30

a) Solve the diff eq

b) Find the population after 2.5 months

c) Find lim P(t) as t -> infinity

Homework Equations



P(t) = P0 P1 /(P0 + (P1 - P0 )e^(-AP1 t))

A = k3 /2
P1 = (2k1 / k3 ) +1

The Attempt at a Solution


 
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hi, beccajd
You have pretty much done part a) already. You have written down the correct solution. So now you can work out what k1 and k3 should be, by looking at the numbers in the equation given to you. I think this is everything they expect from part a). Try doing part b), it shouldn't be too difficult, since you have got the equation for it.
 

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