Calculus Concepts: An Informal Approach to the Mathematics of Change 5th Edition

Published by Brooks Cole
ISBN 10: 1-43904-957-2
ISBN 13: 978-1-43904-957-0

Chapter 3 - Determining Change: Derivatives - 3.4 Activities - Page 224: 17

Answer

$\frac{1}{x}$

Work Step by Step

Let $y= \ln(35 x)$ and substitute $t=35x$. Then, $y=\ln t$. According to the chain rule, we have $\frac{dy}{dx}=\frac{dy}{dt}\cdot\frac{dt}{dx}=\frac{1}{t}\cdot35= \frac{1}{35x}\cdot35$ $=\frac{1}{x}$
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