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The population of a small coastal resort town, currently 2400, grows at a rate of [tex]2\%[/tex] per year. This growth can be expressed by the exponential equation [tex]P=2400(1+0.02)^t[/tex], where [tex]P[/tex] is the population after [tex]t[/tex] years.

What steps would you take to find the number of years it would take for the population to exceed 9000?

Choose all that apply:
A. [tex]t \ \textgreater \ \frac{\log 3.75}{\log 1.02}[/tex]
B. Take [tex]\log[/tex] of both sides
C. Set the population greater than 9000
D. Take [tex]\log[/tex] of both sides
E. [tex]t \ \textgreater \ \frac{\log 3.75}{\log 1.10}[/tex]

Sagot :

To find the number of years it would take for the population to exceed 9,000, we should follow these steps:

1. Set the population equation greater than 9,000:
[tex]\[ 2400 \cdot (1 + 0.02)^t > 9000 \][/tex]

2. Take the logarithm of both sides of the inequality to help solve for [tex]\( t \)[/tex]:
[tex]\[ \log(2400 \cdot (1.02)^t) > \log(9000) \][/tex]

3. Apply the properties of logarithms to simplify:
[tex]\[ \log(2400) + \log((1.02)^t) > \log(9000) \][/tex]
Which can further be simplified using the power rule of logarithms:
[tex]\[ \log(2400) + t \cdot \log(1.02) > \log(9000) \][/tex]

4. Isolate [tex]\( t \)[/tex]:
[tex]\[ t \cdot \log(1.02) > \log(9000) - \log(2400) \][/tex]
[tex]\[ t > \frac{\log(9000) - \log(2400)}{\log(1.02)} \][/tex]

So, the correct steps include:
- Set the population greater than 9000 (Option c).
- Take the log of both sides (Option d).

Therefore, the selected options should be:
- c. Set the population greater than 9000
- d. Take log of both sides

To summarize, the inequality that isolates [tex]\( t \)[/tex] is:
[tex]\[ t > \frac{\log(9000) - \log(2400)}{\log(1.02)} \][/tex]
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