High School

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Paul is gathering data about moss growth in a local forest. He measured an area of 11 square centimeters 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]$14.7 \, \text{cm}^2$[/tex]
B. [tex]$16.5 \, \text{cm}^2$[/tex]
C. [tex]$99.1 \, \text{cm}^2$[/tex]
D. [tex]$125.3 \, \text{cm}^2$[/tex]

Answer :

To determine how much area the moss will cover after 6 months, we need to understand that the moss’s growth is exponential. Here’s how we can calculate it step by step:

1. Initial Info: We know the initial area covered by moss is 11 square centimeters.

2. Growth Rate: The moss area grows by one and a half times each month. This means that each month, the area is multiplied by 1.5.

3. Time Period: We want to find out the area covered by the moss after 6 months.

4. Calculation: To find the area after 6 months, we need to repeatedly apply the growth rate for each month. This is an example of exponential growth.

- After 1 month, the area would be: [tex]\(11 \times 1.5\)[/tex].
- After 2 months, the area would grow again by a factor of 1.5: [tex]\(11 \times 1.5 \times 1.5\)[/tex].
- Continue this multiplication for each month up to 6 months.

We can write this calculation as:
[tex]\[
\text{Area after 6 months} = 11 \times (1.5)^6
\][/tex]

5. Result: When you do this calculation, you find that the area covered by the moss after 6 months is approximately 125.3 square centimeters.

Therefore, the correct answer is:

D. [tex]\(125.3 \, \text{cm}^2\)[/tex]

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