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**Lab Module 4 - Exponential Growth in Collin County**

**Population Increase Overview:**

The population of Collin County, which follows an exponential growth model, increased from 491,675 in the year 2000 to 782,341 in 2010.

---

**a. Exponential Growth Rate Calculation:**

To find the exponential growth rate \( k \), use the exact value of the growth:

- **Population Growth Formula:** 
  \[
  P(t) = P_0 e^{kt}
  \]
  - \( P_0 = 491,675 \)
  - \( P(10) = 782,341 \)

- **Calculation:**
  \[
  782,341 = 491,675 e^{10k}
  \]
  \[
  \frac{782,341}{491,675} = e^{10k}
  \]
  \[
  \ln\left(\frac{782,341}{491,675}\right) = 10k
  \]

**Growth Rate \( k \):** 
\[
k = \frac{\ln\left(\frac{782,341}{491,675}\right)}{10}
\]

---

**b. Exponential Growth Function:**

Using the growth rate from part a, the function is:
\[
P(t) = 491,675 e^{\left(\frac{\ln\left(\frac{782,341}{491,675}\right)}{10}\right)t}
\]

---

**c. Projected Population in 2016:**

- Time \( t = 2016 - 2000 = 16 \) years
- Function for 2016:
  \[
  P(16) = 491,675 e^{\left(\frac{\ln\left( \frac{782,341}{491,675} \right)}{10}\right) \cdot 16}
  \]

**Approximate Population in 2016:** 
1,033,777 people

---

**d. Time to Reach Population of 999,999:**

- Set equation:
  \[
  999,999 = 491,675 e^{\left(\frac{\ln\left(\frac{782,341}{491,675}\right)}{10}\right)t}
  \]
- Solve for \( t \):
  \[
  \
Transcribed Image Text:**Lab Module 4 - Exponential Growth in Collin County** **Population Increase Overview:** The population of Collin County, which follows an exponential growth model, increased from 491,675 in the year 2000 to 782,341 in 2010. --- **a. Exponential Growth Rate Calculation:** To find the exponential growth rate \( k \), use the exact value of the growth: - **Population Growth Formula:** \[ P(t) = P_0 e^{kt} \] - \( P_0 = 491,675 \) - \( P(10) = 782,341 \) - **Calculation:** \[ 782,341 = 491,675 e^{10k} \] \[ \frac{782,341}{491,675} = e^{10k} \] \[ \ln\left(\frac{782,341}{491,675}\right) = 10k \] **Growth Rate \( k \):** \[ k = \frac{\ln\left(\frac{782,341}{491,675}\right)}{10} \] --- **b. Exponential Growth Function:** Using the growth rate from part a, the function is: \[ P(t) = 491,675 e^{\left(\frac{\ln\left(\frac{782,341}{491,675}\right)}{10}\right)t} \] --- **c. Projected Population in 2016:** - Time \( t = 2016 - 2000 = 16 \) years - Function for 2016: \[ P(16) = 491,675 e^{\left(\frac{\ln\left( \frac{782,341}{491,675} \right)}{10}\right) \cdot 16} \] **Approximate Population in 2016:** 1,033,777 people --- **d. Time to Reach Population of 999,999:** - Set equation: \[ 999,999 = 491,675 e^{\left(\frac{\ln\left(\frac{782,341}{491,675}\right)}{10}\right)t} \] - Solve for \( t \): \[ \
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