Answer:
1/5
Explanation:
Given the equation:
[tex]10^{2y}=25[/tex]
The given equation can be written as:
[tex]\begin{gathered} (10^y)^2=5^2 \\ \implies10^y=5 \end{gathered}[/tex]
Raise both sides of the equation to an index of -1.
[tex]\begin{gathered} (10^y)^{-1}=5^{-1} \\ \implies10^{-y}=\frac{1}{5} \end{gathered}[/tex]
The correct answer is 1/5.
