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The population, [tex]p[/tex], of a town after [tex]t[/tex] years is represented using the equation [tex]p = 10000(1.04)^{-t}[/tex]. Which of the following is an equivalent expression?

A. [tex]p = 10000\left(\frac{1}{25}\right)^t[/tex]

B. [tex]p = 10000\left(\frac{25}{26}\right)^t[/tex]

C. [tex]p = 10000\left(\frac{26}{25}\right)^t[/tex]

D. [tex]p = 10000\left(\frac{25}{1}\right)^t[/tex]

Answer :

To solve the problem of finding an equivalent expression for the population equation [tex]\( p = 10000(1.04)^{-t} \)[/tex], we need to rewrite the base [tex]\( 1.04 \)[/tex] in terms of a fraction:

1. Notice the original expression:
[tex]\[
p = 10000(1.04)^{-t}
\][/tex]
This can be rewritten as:
[tex]\[
p = 10000\left(\frac{1}{1.04}\right)^t
\][/tex]

2. The challenge is to find a fraction equivalent to [tex]\(\frac{1}{1.04}\)[/tex] that matches one of the given choices:

To do this, you observe that:
[tex]\[
1.04 \approx \frac{26}{25}
\][/tex]
Therefore, using the fraction:
[tex]\[
\frac{1}{1.04} \approx \frac{25}{26}
\][/tex]

3. Replace the base in the original equation with this fraction:
[tex]\[
p = 10000\left(\frac{25}{26}\right)^t
\][/tex]

This expression is equivalent to the given population equation, and thus the correct choice is:
[tex]\[
p = 10000\left(\frac{25}{26}\right)^t
\][/tex]

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