High School

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Select the correct answer.

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

Answer :

We start with an initial area of moss of [tex]$11 \, \text{cm}^2$[/tex] on the tree. The moss grows by multiplying its area by [tex]$1.5$[/tex] each month. After [tex]$6$[/tex] months, the final area [tex]$A$[/tex] can be found by:

[tex]$$
A = 11 \times (1.5)^6
$$[/tex]

Calculating [tex]$(1.5)^6$[/tex] gives approximately [tex]$11.390625$[/tex], so:

[tex]$$
A \approx 11 \times 11.390625 \approx 125.3 \, \text{cm}^2.
$$[/tex]

Thus, the approximate area of moss after [tex]$6$[/tex] months is [tex]$125.3 \, \text{cm}^2$[/tex], which corresponds to answer choice D.

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