Question
Solve the problem. 14) The rabbit population in a forest area grows at the rate of \( 8 \% \) monthly. If there are 280 rabbits in April, find how many rabbits (rounded to the nearest whole number) should be expected by next April. Use \( y=280(2.7)^{0.08 t} \).
Ask by Wang Lindsey. in the United States
Feb 04,2025
Real Tutor Solution
Tutor-Verified Answer
Answer
By next April, there will be approximately 727 rabbits.
Solution
To determine the rabbit population by next April, we'll use the provided growth formula:
\[ y = 280 \times (2.7)^{0.08t} \]
where:
- \( y \) is the expected rabbit population,
- \( 280 \) is the initial number of rabbits in April,
- \( 2.7 \) is an approximation of Euler's number \( e \) (≈2.71828),
- \( 0.08 \) represents the monthly growth rate (8\%),
- \( t \) is the time in months.
**Step 1: Determine the Time Period**
From April to next April is **12 months**. Thus, \( t = 12 \).
**Step 2: Substitute the Values into the Formula**
\[ y = 280 \times (2.7)^{0.08 \times 12} \]
\[ y = 280 \times (2.7)^{0.96} \]
**Step 3: Calculate \( (2.7)^{0.96} \)**
Using logarithmic and exponential approximations:
1. **Calculate \( \ln(2.7) \):**
\[ \ln(2.7) \approx 0.9935 \]
2. **Multiply by the exponent:**
\[ 0.9935 \times 0.96 \approx 0.9535 \]
3. **Calculate \( e^{0.9535} \):**
\[ e^{0.9535} \approx 2.597 \]
**Step 4: Final Calculation**
\[ y \approx 280 \times 2.597 \]
\[ y \approx 727 \]
**Conclusion**
By next April, the expected rabbit population is **727 rabbits** (rounded to the nearest whole number).
**Answer:**
After one year, approximately 727 rabbits are expected by next April.
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Extra Insights
To solve the problem, we need to evaluate the equation \( y = 280(2.7)^{0.08 t} \) for \( t = 12 \) months since we want to find the population by the next April. Substituting \( t = 12 \): \[ y = 280(2.7)^{0.08 \times 12} \] \[ y = 280(2.7)^{0.96} \] Now we can calculate the growth: 1. First, calculate \( (2.7)^{0.96} \) which is approximately \( 2.55 \). 2. Now, multiply this value by 280: \[ y \approx 280 \times 2.55 \approx 714 \] Therefore, the expected rabbit population by next April is approximately 714 rabbits when rounded to the nearest whole number!