Answer
$\log_t (H\cdot M)$
Work Step by Step
Using $\log_b x +\log_b y=\log_b(xy),$ the given logarithmic equation, $
\log_t H+\log_t M
,$ is equivalent to
\begin{array}{l}\require{cancel}
\log_t (H\cdot M)
.\end{array}
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