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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)^2[/tex]

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

C. [tex]p=10000\left(\frac{26}{25}\right)^2[/tex]

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

Answer :

To solve this problem, we need to find an expression equivalent to the given population model:

[tex]\[ p = 10000(1.04)^{-t} \][/tex]

Let's break this down step by step:

1. Understand the Original Expression:
- The original equation given is [tex]\( p = 10000(1.04)^{-t} \)[/tex].
- The expression involves an exponent with a negative sign: [tex]\((1.04)^{-t}\)[/tex].

2. Rewrite the Negative Exponent:
- A negative exponent means taking the reciprocal of the base and reversing the sign of the exponent.
- Therefore, [tex]\((1.04)^{-t} = \left(\frac{1}{1.04}\right)^t\)[/tex].

3. Simplify the Base:
- We need to simplify the base [tex]\(\frac{1}{1.04}\)[/tex].
- Divide 1 by 1.04:

[tex]\[
\frac{1}{1.04} = 0.9615384615 \, \text{(approx.)}
\][/tex]

4. Convert Decimal to Fraction:
- The decimal 0.961538... is equivalent to the fraction [tex]\(\frac{25}{26}\)[/tex].

5. Substitute Back:
- Substituting back to the expression, we have:

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

6. Select the Equivalent Expression:
- From the given options, choose the expression that matches:

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

Therefore, the equivalent expression is:

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

This corresponds to the option: [tex]\( p=10000\left(\frac{25}{26}\right)^{,} \)[/tex] (Note: It seems there might be a typo in the option itself, but the mathematical representation matches our derived expression).

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