ANSWER:
[tex]\log _4(10)-\log _4(y)[/tex]STEP-BY-STEP EXPLANATION:
We have the following expression:
[tex]\begin{gathered} \log _4\mleft(\frac{10}{y}\mright) \\ \text{ rewrite:} \\ \log _4\mleft(\frac{10}{y}\mright)=\log _4(10)-\log _4(y) \end{gathered}[/tex]