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After years of maintaining a steady population of 32,000, the population of a town begins to grow exponentially. After 1 year and an increase of [tex]$8\%$[/tex] per year, the population is 34,560. Which equation can be used to predict [tex]$y$[/tex], the number of people living in the town after [tex]$x$[/tex] years? (Round population values to the nearest whole number.)

A. [tex]$y=32,000(1.08)^x$[/tex]
B. [tex]$y=32,000(0.08)^x$[/tex]
C. [tex]$y=34,560(1.08)^x$[/tex]
D. [tex]$y=34,560(0.08)^x$[/tex]


Sagot :

To solve this problem, let's analyze the given information and determine which equation best models the exponential growth of the town's population.

### Step-by-Step Solution:

1. Initial Population and Growth Information:
- The initial population of the town is 32,000 people.
- The population grows at an exponential rate of 8% per year.
- After one year, the population is given as 34,560 people.

2. Understanding Exponential Growth:
Exponential growth can be modeled using the equation:
[tex]\[ y = P(1 + r)^x \][/tex]
where:
- [tex]\(y\)[/tex] is the future population,
- [tex]\(P\)[/tex] is the initial population,
- [tex]\(r\)[/tex] is the growth rate,
- [tex]\(x\)[/tex] is the number of years.

3. Substituting Values:
- Initial population, [tex]\(P\)[/tex] = 32,000.
- Growth rate, [tex]\(r\)[/tex] = 8% = 0.08.

4. Equation for the Population After [tex]\(x\)[/tex] Years:
Substituting [tex]\(P\)[/tex] and [tex]\(r\)[/tex] into the exponential growth equation, we get:
[tex]\[ y = 32,000(1 + 0.08)^x = 32,000(1.08)^x \][/tex]

5. Verification with Given Data:
To verify, we can check if this equation fits the population after one year ([tex]\(x = 1\)[/tex]):
[tex]\[ y = 32,000(1.08)^1 = 32,000 \times 1.08 = 34,560 \][/tex]
This matches the provided population after one year, confirming that our equation is correct.

6. Choosing the Correct Equation from the Options:
The provided options are:
- [tex]\(y = 32,000(1.08)^x\)[/tex]
- [tex]\(y = 32,000(0.08)^x\)[/tex]
- [tex]\(y = 34,560(1.08)^x\)[/tex]
- [tex]\(y = 34,560(0.08)^x\)[/tex]

Among these options, the correct equation is:
[tex]\[ y = 32,000(1.08)^x \][/tex]

### Conclusion:
The correct equation that predicts the number of people living in the town after [tex]\(x\)[/tex] years, considering the initial population and the given growth rate, is:
[tex]\[ y = 32,000(1.08)^x \][/tex]

Thus, the answer is:

[tex]\[ y = 32,000(1.08)^x \][/tex]

This equation correctly models the exponential growth of the town's population over time.