5−2 5^{-2} 5−2
We use the property of powers of a negative exponent:
a−n=1an a^{-n}=\frac{1}{a^n} a−n=an1We apply it to the problem:
5−2=152=125 5^{-2}=\frac{1}{5^2}=\frac{1}{25} 5−2=521=251
Therefore, the correct answer is option d.
125 \frac{1}{25} 251