Integration and population dynamics?

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Discussion Overview

The discussion revolves around the integration of a rate function to determine the increase in a mosquito population over a specified time interval. Participants explore the application of integration in the context of population dynamics, specifically focusing on a scenario involving a mosquito population increase due to environmental conditions.

Discussion Character

  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant presents a problem involving the rate of increase of a mosquito population, expressed as 2200 + 10e^(0.8t) per week.
  • Another participant identifies the need to find the difference in population between the fifth and ninth weeks using the anti-derivative form of the Fundamental Theorem of Calculus.
  • There is a request for clarification on how to integrate the given rate function to find the population increase.
  • One participant suggests integrating the function from 5 to 9 to find the population increase, expressing uncertainty about the correctness of this approach.
  • A later reply confirms the integration approach and expresses confidence in the calculation.
  • Another participant notes that since population is discrete, a floor function is applied to the result of the integral to arrive at a final population increase estimate.

Areas of Agreement / Disagreement

Participants generally agree on the method of integration to find the population increase, but there is some uncertainty regarding the application of the floor function to the result. The discussion does not reach a consensus on the interpretation of the population as discrete versus continuous.

Contextual Notes

There are limitations regarding the assumptions about the continuity of the population model and the implications of using a floor function in the context of population dynamics.

Who May Find This Useful

This discussion may be useful for individuals interested in mathematical modeling of population dynamics, integration techniques, and the application of the Fundamental Theorem of Calculus in real-world scenarios.

ineedhelpnow
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can someone explain this problem step by step (not a homework problem, just an example i found and i want to see how its done).

a hot wet summer is causing a mosquito population explosion in a lake resort area. the number of mosquitoes is increasing at an estimated rate of 2200+10e^(0.8t) per week (t is in weeks). by how much does the mosquito population increase between the fifth and ninth weeks of summer.
 
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We are given:

$$\d{P}{t}$$

and asked to find:

$$N=P(9)-P(5)$$

Can you see how to use the anti-derivative form of the FTOC here?
 
no do you mind explaining?
 
If you are given $dP$ what operation can you use to find $P$? If you want to find $P(a)-P(b)$ what operation would you use from $dP$? Something should come to mind.
 
this is probably wrong but do i just integrate 2200+10e^0.8t from 5 to 9?

@Jameson this sounds super weird but I get a happy feeling whenever i see your username and your profile picture. its' so cool man, i swear. :D
 
ineedhelpnow said:
this is probably wrong but do i just integrate 2200+10e^0.8t from 5 to 9?

Let's take a look:

$$P(9)-P(5)=\int_5^9\,dP=\int_5^9\d{P}{t}\,dt$$

Yep, looks good to me. :D
 
soooo...24860? does that sound right?
 
Yes, since a population is discrete rather than continuous we would use:

$$N=\left\lfloor \int_5^9 2200+10e^{0.8t}\,dt \right\rceil=24860$$
 
ok thanks.
 

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