Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 4 - Review - Exercises - Page 389: 74



Work Step by Step

$e^{-15k}=10000$ Apply $\ln$ to both sides of the equation: $\ln e^{-15k}=\ln10000$ Take $-15k$ down to multiply in front of its $\ln$: $-15k\ln e=\ln10000$ Since $\ln e=1$, this equation becomes: $-15k=\ln10000$ Solve for $k$: $k=-\dfrac{\ln10000}{15}\approx-0.614023$
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