Answer
$$3\log _{10}\left(2\right)-4\log _{10}\left(y\right)$$
Work Step by Step
Using the rules of logarithms, we find:
$$\log _{10}\left(8\right)-\log _{10}\left(y^4\right) \\ 3\log _{10}\left(2\right)-4\log _{10}\left(y\right)$$
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