#### Answer

The derivative is negative whenever $\ln b $ is negative.

#### Work Step by Step

Suppose that $ y=b^x $, then we get $\ln y=x \ln b $. Then, $ y'=b^x\ln b $. Hence the derivative is negative whenever $\ln b $ is negative.

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Published by
W. H. Freeman

ISBN 10:
1464125260

ISBN 13:
978-1-46412-526-3

The derivative is negative whenever $\ln b $ is negative.

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