Math Problem Statement

In an effort to control vegetation overgrowth, 149149 rabbits are released in an isolated area free of predators. After 33 years, it is estimated that the rabbit population has increased to 11921192. Assuming exponential population growth, what will the population be after another 66 months? Round to the nearest rabbit.

Solution

We can solve this problem using the formula for exponential growth:

P(t)=P0ektP(t) = P_0 e^{kt}

Where:

  • P(t)P(t) is the population at time tt,
  • P0P_0 is the initial population,
  • kk is the growth rate constant,
  • tt is the time in years (we will adjust as needed).

Step 1: Define known values

  • Initial population P0=149149P_0 = 149149,
  • Population after 33 years P(33)=11921192P(33) = 11921192,
  • Time t=33t = 33 years.

Step 2: Solve for the growth constant kk

Using the exponential growth formula:

11921192=149149e33k11921192 = 149149 e^{33k}

To isolate kk, divide both sides by 149149:

11921192149149=e33k\frac{11921192}{149149} = e^{33k}

79.9e33k79.9 \approx e^{33k}

Now take the natural logarithm of both sides:

ln(79.9)=33k\ln(79.9) = 33k

ln(79.9)4.381\ln(79.9) \approx 4.381

So,

33k=4.38133k = 4.381

Now solve for kk:

k=4.381330.132k = \frac{4.381}{33} \approx 0.132

Step 3: Calculate the population after 66 months

66 months is 6612=5.5\frac{66}{12} = 5.5 years.

Using the exponential growth formula again, we find the population after 5.5 years:

P(5.5)=149149e0.132×5.5P(5.5) = 149149 e^{0.132 \times 5.5}

P(5.5)=149149e0.726P(5.5) = 149149 e^{0.726}

P(5.5)=149149×2.067308657P(5.5) = 149149 \times 2.067 \approx 308657

Final Answer:

After another 66 months, the population is approximately 308,657 rabbits (rounded to the nearest rabbit).


Would you like more details or further clarification?

Here are some additional related questions:

  1. How do you determine the growth rate constant kk more generally from population data?
  2. What happens to the population if the environment starts to limit growth?
  3. How would the population calculation change if a predator were introduced?
  4. How do exponential and logistic growth models differ in real-world scenarios?
  5. What would the population be after 10 years under the same growth conditions?

Tip: When dealing with exponential growth problems, it’s important to pay attention to the units of time and make sure they match up (in this case, years and months).

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Math Problem Analysis

Mathematical Concepts

Exponential Growth
Population Modeling
Logarithms

Formulas

P(t) = P0 * e^(kt)
k = (ln(P(t) / P0)) / t

Theorems

Exponential Growth Model

Suitable Grade Level

Grades 10-12, College Algebra