Answer
$2$
Work Step by Step
We know that $\log_a {x}+\log_a {y}=\log_a {(x\cdot y)}$.
Hence,
$\log_6 {4}+\log_6 {9}
\\=\log_6{(4\cdot 9)}
\\=\log_6{36}
\\=log_6 {(6^2)}$.
We know that $\log_a {a^x}=x$.
Thus,
$\log_6 {6^2}=2$
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