#### Answer

C. 10

#### Work Step by Step

We know that logarithms to base 10 are common logarithms, and $log_{10}x$ is equivalent to $log(x)$.
Therefore, the base of $log(x)$ is 10.

Published by
Pearson

ISBN 10:
0321969359

ISBN 13:
978-0-32196-935-4

C. 10

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