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The rate of change 
(dP)/(dt) of the number of students who heard a rumor is modeled by the following differential equation:

(dP)/(dt)=(8580)/(94019)P(1-(P)/( 780))
At 
t=0, the number of students who heard the rumor is 149 and is increasing at a rate of 11 students per hour. Find 
lim_(t rarr oo)P^(')(t).
Answer:

The rate of change dPdt \frac{d P}{d t} of the number of students who heard a rumor is modeled by the following differential equation:\newlinedPdt=858094019P(1P780) \frac{d P}{d t}=\frac{8580}{94019} P\left(1-\frac{P}{780}\right) \newlineAt t=0 t=0 , the number of students who heard the rumor is 149149 and is increasing at a rate of 1111 students per hour. Find limtP(t) \lim _{t \rightarrow \infty} P^{\prime}(t) .\newlineAnswer:

Full solution

Q. The rate of change dPdt \frac{d P}{d t} of the number of students who heard a rumor is modeled by the following differential equation:\newlinedPdt=858094019P(1P780) \frac{d P}{d t}=\frac{8580}{94019} P\left(1-\frac{P}{780}\right) \newlineAt t=0 t=0 , the number of students who heard the rumor is 149149 and is increasing at a rate of 1111 students per hour. Find limtP(t) \lim _{t \rightarrow \infty} P^{\prime}(t) .\newlineAnswer:
  1. Given Differential Equation: We are given the differential equation:\newlinedPdt=858094019P(1P780)\frac{dP}{dt}=\frac{8580}{94019}P\left(1-\frac{P}{780}\right)\newlineWe want to find the limit of P(t)P'(t) as tt approaches \infty, which is essentially the long-term behavior of the rate of change of PP.
  2. Analysis of Equation: To find the limit of P(t)P'(t) as tt approaches infinity, we need to analyze the differential equation. The equation is a logistic growth model, which typically approaches a stable value as tt approaches infinity.
  3. Stable Value and Carrying Capacity: In the logistic growth model, the stable value, also known as the carrying capacity, is the value of PP where the growth rate P(t)P'(t) becomes zero. This happens when PP equals the denominator of the fraction in the parenthesis, which is 780780 in this case.
  4. Approaching Limit: So, as tt approaches \infty, PP will approach the carrying capacity, and the rate of change P(t)P'(t) will approach zero. This is because the term (1(P/780))(1 - (P/780)) will approach zero as PP approaches 780780.
  5. Final Limit: Therefore, the limit of P(t)P'(t) as tt approaches extinfinity ext{infinity} is 00.

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