Math Problem Statement

The number of bacteria in a certain population is predicted to increase according to a continuous exponential growth model, at a relative rate of 6% per hour. Suppose that a sample culture has an initial population of 265 bacteria. Find the population predicted after four hours, according to the model.

Solution

The problem describes bacterial population growth following a continuous exponential growth model with a growth rate of 6% per hour.

The formula for continuous exponential growth is:

P(t)=P0ertP(t) = P_0 \cdot e^{rt}

Where:

  • P(t)P(t) is the population at time tt,
  • P0P_0 is the initial population,
  • rr is the growth rate (as a decimal),
  • tt is the time in hours,
  • ee is Euler's number (approximately 2.71828).

Given dataThe problem describes bacterial population growth following a continuous exponential growth model with a growth rate of 6% per hour.

The formula for continuous exponential growth is:

P(t)=P0ertP(t) = P_0 \cdot e^{rt}

Where:

  • P(t)P(t) is the population at time tt,
  • P0P_0 is the initial population,
  • rr is the growth rate (as a decimal),
  • tt is the time in hours,
  • ee is Euler's number (approximately 2.71828).

Given

  • Initial population P0=265P_0 = 265 bacteria,
  • Growth rate r=0.06r = 0.06 (since 6% = 0.06),
  • Time t=4t = 4 hours.

Now, we will substitute these values into the formula to find the population after 4 hours:

P(4)=265e0.064P(4) = 265 \cdot e^{0.06 \cdot 4}

First, calculate the exponent: 0.064=0.240.06 \cdot 4 = 0.24

Next, calculate e0.24e^{0.24}: e0.241.27125e^{0.24} \approx 1.27125

Finally, calculate the population: P(4)=2651.27125336.9P(4) = 265 \cdot 1.27125 \approx 336.9

So, the population after 4 hours is approximately 336.9 bacteria.

Would you like further details or explanations on any part of this calculation?

Here are 5 related questions for deeper understanding:

  1. How does the population change if the growth rate increases to 10%?
  2. What happens to the population after 6 hours under the same growth model?
  3. Can the exponential model be used for other biological growth processes, and if so, how?
  4. What is the significance of Euler's number ee in continuous growth models?
  5. How would the solution change if the population were modeled using a logistic growth curve?

Tip: In continuous exponential growth, the population grows at a rate proportional to its current size, which means growth accelerates over time.

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Math Problem Analysis

Mathematical Concepts

Exponential Growth
Algebra

Formulas

P(t) = P_0 * e^(rt)

Theorems

Continuous Exponential Growth Model

Suitable Grade Level

Grades 9-12