The length of a stalactite (in mm) has been measured at the beginning of every fourth year since the year 2000. The data through 2016 is shown below, where t is in years after the beginning of the year 2000. t Length (mm) 0 105 Logistic y= (y= Use the data to construct a scatter plot, then complete the following. 1) Which of the following best describes the pattern? O A. C 1+ae - bx B. Exponential (y = a.bx) O C. Linear (y = mx + b) 4 110 8 116 2) Using your calculator and the best of the four methods above, find a model, L(t), that estimates the length of the stalactite t years after 2000. ROUND TO TWO DECIMAL PLACES. L(t) = 3) Use your rounded answer from part 2 to complete the following. ROUND TO TWO DECIMAL PLACES. Acording to the model, at the beginning of the year 2007, the stalactite was approximately mm long, and it was growing at a rate of approximately 12 120 mm per year. 16 125

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Chapter1: Functions And Models
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**Stalactite Growth Data Analysis**

The length of a stalactite (in mm) has been measured at the beginning of every fourth year since the year 2000. The data through 2016 is shown below, where \( t \) is in years after the beginning of the year 2000.

| \( t \) (years) | Length (mm) |
|----------------|-------------|
| 0              | 105         |
| 4              | 110         |
| 8              | 116         |
| 12             | 120         |
| 16             | 125         |

**Tasks**

1) **Pattern Identification**

   Use the data to construct a scatter plot. Then, choose which of the following best describes the pattern:

   - **A. Logistic** 
     \[
     y = \frac{c}{1 + a e^{-bx}}
     \]

   - **B. Exponential** 
     \[
     y = a \cdot b^x
     \]

   - **C. Linear** 
     \[
     y = mx + b
     \]

2) **Model Calculation**

   Using your calculator and the best-fitting method from above, find a model, \( L(t) \), that estimates the length of the stalactite \( t \) years after 2000. **Round to two decimal places.**

   \( L(t) = \) [ ]

3) **Analysis**

   Use your rounded answer from part 2 to complete the following. **Round to two decimal places.**

   According to the model, at the beginning of the year 2007:
   - The stalactite was approximately [ ] mm long.
   - It was growing at a rate of approximately [ ] mm per year.
Transcribed Image Text:**Stalactite Growth Data Analysis** The length of a stalactite (in mm) has been measured at the beginning of every fourth year since the year 2000. The data through 2016 is shown below, where \( t \) is in years after the beginning of the year 2000. | \( t \) (years) | Length (mm) | |----------------|-------------| | 0 | 105 | | 4 | 110 | | 8 | 116 | | 12 | 120 | | 16 | 125 | **Tasks** 1) **Pattern Identification** Use the data to construct a scatter plot. Then, choose which of the following best describes the pattern: - **A. Logistic** \[ y = \frac{c}{1 + a e^{-bx}} \] - **B. Exponential** \[ y = a \cdot b^x \] - **C. Linear** \[ y = mx + b \] 2) **Model Calculation** Using your calculator and the best-fitting method from above, find a model, \( L(t) \), that estimates the length of the stalactite \( t \) years after 2000. **Round to two decimal places.** \( L(t) = \) [ ] 3) **Analysis** Use your rounded answer from part 2 to complete the following. **Round to two decimal places.** According to the model, at the beginning of the year 2007: - The stalactite was approximately [ ] mm long. - It was growing at a rate of approximately [ ] mm per year.
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Why did you subtract 115-105 in question #2 and not 110-105? Where did 115 come from?

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