Answer
(a) $\log_3{10}=2x$
(b) $\log{0.1}=-4x$
Work Step by Step
RECALL:
$b^y=x \longrightarrow \log_b{x}=y$
Use the rule above to obtain:
(a) $\log_3{10}=2x$
(b) $\log{0.1}=-4x$ (note that common log has $b=10$)
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