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Exponential Data

In this activity, you will graph and write exponential functions to model population data presented in tables. Then you’ll use your models to make predictions and draw a conclusion.

Question 1
A town’s population has been exponentially increasing for the past 10 years. The town council initially recorded the town’s population at 6,000 people and tracked it each year after that. The table represents their data.

Years Town Population
(in thousands)
0 6
1 6.9
2 9
3 10.5
4 13
5 14.2
6 18
7 20.8
8 26
9 31.3
Use the graphing tool to plot the population data and determine the curve of best fit.

Part A
Question
What is the equation of the curve of best fit for the population data?

Enter the correct answer in the box by replacing a and b with the values from the graphing tool. Do not round the values of a and b.


Part B
Question
If the town continues to grow at the same rate, approximately what will be the population, to the nearest 100 people, 25 years after the town council started tracking the population data?

341,100 people
180,000 people
271,200 people
572,400 people
Question 2
Because of the growth in the town’s population, the agricultural department kept track of the town’s native bee population during the same time period. They feared with the increase of people in the town, the bee population would start to decrease, affecting the ecosystem. Their data is shown in the table.

Years Bee Population
(in thousands)
0 320
1 225
2 152.6
3 111.2
4 75
5 56.8
6 36.7
7 26.9
8 17.5
9 13.2
Use the graphing tool to plot the population data and determine the curve of best fit.

Part A
Question
What is the equation of the curve of best fit for the population data?

Enter the correct answer in the box by replacing a and b with the values from the graphing tool. Do not round the values of a and b.


Part B
After several years of recording the data, the agricultural committee requested help from the town council for a grant to boost the bee population. The council denied the request, saying it wouldn’t take any action until the population dropped below 5,000 bees.

In the 12th year after initially recording the bee population, the agricultural committee plans to speak with the board again. Will the committee have a good chance of convincing the board to help support bees this time around? Justify your conclusion using mathematical reasoning.

User Mmccoo
by
8.0k points

2 Answers

1 vote
Part A:
For the town population data, the curve of best fit appears to be an exponential function of the form y = ab^x. Using the graphing tool, we can estimate the values of a and b to be:

a = 5.98
b = 1.121

Therefore, the equation of the curve of best fit is y = 5.98(1.121)^x.

For the bee population data, the curve of best fit also appears to be an exponential function of the form y = ab^x. Using the graphing tool, we can estimate the values of a and b to be:

a = 321.38
b = 0.675

Therefore, the equation of the curve of best fit is y = 321.38(0.675)^x.

Part B:
To find the population of the town 25 years after the council started tracking the population data, we can substitute x = 25 into the equation of the curve of best fit for the town population data:

y = 5.98(1.121)^25 ≈ 572,400

Therefore, the estimated population of the town 25 years after the council started tracking the population data is approximately 572,400 people.

For the bee population data, we can use the equation of the curve of best fit to predict the bee population in the 12th year after initially recording the data, which corresponds to x = 12.y = 321.38(0.675)^12 ≈ 2.92

Therefore, the estimated bee population in the 12th year after initially recording the data is approximately 2,920 bees (rounded to the nearest whole number).

Since the town council has set a threshold of 5,000 bees before taking action to support the bee population, it appears that the agricultural committee will not have a good chance of convincing the board to support bees this time around. The estimated bee population is well below the threshold set by the council, and it would take several years of significant growth for the bee population to reach that level. Therefore, the committee would need to provide strong evidence of the importance of bees to the ecosystem and the potential consequences of not taking action to support them in order to convince the board to change their stance.
User Updogliu
by
8.1k points
1 vote

Answer:

1.The equation of best fit is ŷ = 2.69152X + 3.45818.

Explanation:

User Diego Basch
by
7.6k points

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