Exponential Functions from Situations Quick Check

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Question
Use the table to answer the question.

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A certain population of beetles is increasing at a rate of 22% per month. If there are currently 350 beetles, the equation f(x)=350(1.22)x can be used to model the situation. Finish the chart and plot the points to determine which graph correctly displays the situation.(1 point)
Responses

A decreasing curve with an arrow at the end is plotted on a coordinate plane. The x-axis for months ranges from 0 to 10 in increments of 1. The y-axis for Beetles ranges from 0 to 350 in increments of 50.
Image with alt text: A decreasing curve with an arrow at the end is plotted on a coordinate plane. The x-axis for months ranges from 0 to 10 in increments of 1. The y-axis for Beetles ranges from 0 to 350 in increments of 50.

An increasing curve with an arrow on the top is plotted on a coordinate plane. The x-axis for months ranges from 0 to 10 in increments of 1. The y-axis for Beetles ranges from 0 to 2000 in increments of 250.
Image with alt text: An increasing curve with an arrow on the top is plotted on a coordinate plane. The x-axis for months ranges from 0 to 10 in increments of 1. The y-axis for Beetles ranges from 0 to 2000 in increments of 250.

An increasing curve with an arrow on the top is plotted on a coordinate plane. The x-axis for months ranges from 0 to 2,000 in increments of 200. The y-axis for Beetles ranges from 0 to 10 in increments of 1.
Image with alt text: An increasing curve with an arrow on the top is plotted on a coordinate plane. The x-axis for months ranges from 0 to 2,000 in increments of 200. The y-axis for Beetles ranges from 0 to 10 in increments of 1.

A decreasing curve with an arrow at the end is plotted on a coordinate plane. The x-axis for months ranges from 0 to 10 in increments of 1. The y-axis for Beetles ranges from 0 to 350 in increments of 50.
Image with alt text: A decreasing curve with an arrow at the end is plotted on a coordinate plane. The x-axis for months ranges from 0 to 10 in increments of 1. The y-axis for Beetles ranges from 0 to 350 in increments of 50.
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1 answer

To complete the table based on the given exponential growth model \( f(x) = 350(1.22)^x \) for a population of beetles increasing at a rate of 22% per month, we'll calculate the number of beetles at each specified month:

  1. Month 0: \[ f(0) = 350(1.22)^0 = 350 \times 1 = 350 \]
  2. Month 1: \[ f(1) = 350(1.22)^1 = 350 \times 1.22 \approx 427 \]
  3. Month 2: \[ f(2) = 350(1.22)^2 = 350 \times 1.4884 \approx 520 \]
  4. Month 3: \[ f(3) = 350(1.22)^3 = 350 \times 1.8038 \approx 631 \]
  5. Month 4: \[ f(4) = 350(1.22)^4 = 350 \times 2.198 \approx 769 \]
  6. Month 5: \[ f(5) = 350(1.22)^5 = 350 \times 2.683 \approx 939 \]

Now, let's summarize the completed table:

| Month (x) | Population (f(x)) | |-----------|--------------------| | 0 | 350 | | 1 | 427 | | 2 | 520 | | 3 | 631 | | 4 | 769 | | 5 | 939 |

Conclusion

The function models exponential growth, so the graph will be an increasing curve as the population of beetles increases over time.

Therefore, the correct graph should show an increasing curve with an arrow on the top. The response that fits this description is:

An increasing curve with an arrow on the top is plotted on a coordinate plane. The x-axis for months ranges from 0 to 10 in increments of 1. The y-axis for Beetles ranges from 0 to 2000 in increments of 250.

This graph accurately represents the growth of the beetle population over time based on the provided model.

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