Math Problem Statement

A population grows according to the logistic growth​ model, with growth parameter

requals=0.80.8.

Starting with an initial population given by

p Subscript 0equals=0.70.7​,

complete parts​ (a) and​ (b) below.

Question content area bottom

Part 1

​(a) Find the values of

p Subscript 1

through

p Subscript 10.

Solution

To solve this logistic growth problem, we use the logistic growth model equation:

pn+1=rpn(1pn)p_{n+1} = r \cdot p_n \cdot (1 - p_n)

where:

  • rr is the growth rate (r=0.8r = 0.8),
  • p0p_0 is the initial population (p0=0.7p_0 = 0.7),
  • pnp_n is the population at generation nn,
  • pn+1p_{n+1} is the population at the next generation.

We will compute p1p_1 through p10p_{10} step by step using this recurrence relation.

Step-by-Step Calculation

Given p0=0.7p_0 = 0.7:

  1. p1=0.80.7(10.7)p_1 = 0.8 \cdot 0.7 \cdot (1 - 0.7)
  2. p2=0.8p1(1p1)p_2 = 0.8 \cdot p_1 \cdot (1 - p_1)
  3. Repeat until p10p_{10}.

Let’s calculate numerically: Logistic growth model parameters r = 0.8 # Growth rate p0 = 0.7 # Initial population n_steps = 10 # Number of iterations to calculate

List to store population values for p_0 to p_10

population_values = [p0]

Iteratively compute population values

for i in range(n_steps): pn = population_values[-1] pn_next = r * pn * (1 - pn) # Logistic growth formula population_values.append(pn_next)

population_valuesHere are the computed values of pnp_n from p0p_0 to p10p_{10}:

p_0 & = 0.7 \\ p_1 & = 0.168 \\ p_2 & \approx 0.1118 \\ p_3 & \approx 0.07945 \\ p_4 & \approx 0.05851 \\ p_5 & \approx 0.04407 \\ p_6 & \approx 0.03370 \\ p_7 & \approx 0.02605 \\ p_8 & \approx 0.02030 \\ p_9 & \approx 0.01591 \\ p_{10} & \approx 0.01253 \\ \end{aligned}$$ The population quickly decreases with each step under this logistic growth model due to the high initial value of $$p_0 = 0.7$$, which is close to the equilibrium $$p = 0$$. --- Would you like further explanation of these results, or assistance with part (b)? Here are some related questions for you to consider: 1. What is the long-term behavior of the logistic growth model for this system? 2. How does changing the growth rate $$r$$ affect the population trend? 3. What happens if the initial population $$p_0$$ is below 0.5? 4. Can you plot the values of $$p_n$$ over time to visualize the decay? 5. How does logistic growth compare to exponential growth in this case? **Tip:** Logistic growth models are particularly useful for modeling populations constrained by resources or competition!

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Math Problem Analysis

Mathematical Concepts

Logistic Growth Model
Recurrence Relations
Population Dynamics

Formulas

Logistic growth formula: pn+1 = r * pn * (1 - pn)

Theorems

Logistic Growth Dynamics

Suitable Grade Level

Grades 10-12