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Select the correct answer.

Paul is gathering data about moss growth in a local forest. He measured an area of [tex]$11 \, \text{cm}^2$[/tex] on one particular tree and will come back in 6 months to measure the growth of the moss. If the area covered by moss multiplies by one and a half times each month, approximately how much area will the moss cover when Paul returns?

A. [tex]125.3 \, \text{cm}^2[/tex]
B. [tex]16.5 \, \text{cm}^2[/tex]
C. [tex]99.1 \, \text{cm}^2[/tex]
D. [tex]14.7 \, \text{cm}^2[/tex]

Answer :

To solve the problem of how much area the moss will cover when Paul returns, we need to understand exponential growth. The concept here is that the moss area grows by a factor of one and a half (or 1.5 times) every month. Here's how you can calculate the area covered by the moss after 6 months:

1. Understand the Initial Conditions:
- The initial area of moss is 11 square centimeters.

2. Growth Factor per Month:
- Each month, the area of moss increases by a factor of 1.5.

3. Determine the Time Period:
- Paul will check the moss after 6 months.

4. Calculate the Final Area:
- To find out how much the moss grows, multiply the initial area by the growth factor raised to the power of the number of months. Mathematically, this can be represented as:

[tex]\[
\text{final area} = \text{initial area} \times (\text{growth rate})^{\text{time period}}
\][/tex]

5. Perform the Calculation:

[tex]\[
\text{final area} = 11 \times (1.5)^6
\][/tex]

6. Result:
- Performing this calculation gives you approximately 125.3 square centimeters.

So, after 6 months, the moss will cover approximately 125.3 cm². Therefore, the correct answer is A. 125.3 cm².

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