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Which choice is equivalent to the expression below?

[tex]$5^{-2}$[/tex]

A. [tex]$-\frac{1}{25}$[/tex]
B. [tex]$\frac{1}{10}$[/tex]
C. -10
D. [tex]$\frac{1}{25}$[/tex]

Answer :

We start with the expression
[tex]$$
5^{-2}.
$$[/tex]

Recall that a negative exponent indicates the reciprocal of the base raised to the positive exponent. That is, for any nonzero number [tex]$a$[/tex] and positive integer [tex]$n$[/tex], we have
[tex]$$
a^{-n} = \frac{1}{a^n}.
$$[/tex]

Applying this rule to [tex]$5^{-2}$[/tex] gives:
[tex]$$
5^{-2} = \frac{1}{5^2}.
$$[/tex]

Next, compute [tex]$5^2$[/tex]:
[tex]$$
5^2 = 25.
$$[/tex]

So, the expression becomes:
[tex]$$
5^{-2} = \frac{1}{25}.
$$[/tex]

Thus, the equivalent expression is [tex]$\frac{1}{25}$[/tex], which corresponds to choice D.

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