#### Answer

$\log _{b}\dfrac {km}{a}$

#### Work Step by Step

$\log _{b}k+\log _{b}m-\log _{b}a=\left( \log _{b}k+\log _{b}m\right) -\log _{b}a=\log _{b}km-\log _{b}a=\log _{b}\dfrac {km}{a}$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$\log _{b}\dfrac {km}{a}$

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