Answer
$m\approx3~minutes$
Work Step by Step
$T=20+60e^{-0.06m}$
$70=20+60e^{-0.06m}$
$50=60e^{-0.06m}$
$\frac{5}{6}=e^{-0.06m}$
$\ln e^{-0.06m}=\ln\frac{5}{6}$
$-0.06m=\ln\frac{5}{6}$
$m=\frac{\ln\frac{5}{6}}{-0.06}=3.039$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 5 - 5.4 - Exponential and Logarithmic Equations - 5.4 Exercises - Page 396: 87
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