Answer
$x=0.511$
Work Step by Step
$50e^{-x}=30$
$e^{-x}=\frac{3}{5}$
$-x$ $ln(e)=ln(\frac{3}{5})$
$x=-ln(\frac{3}{5})$
$\approx 0.5108256..$
$=0.511$
Calculus 10th Edition
by Larson, Ron; Edwards, Bruce H.
Published by
Brooks Cole
ISBN 10:
1-28505-709-0
ISBN 13:
978-1-28505-709-5
Chapter 5 - Logarithmic, Exponential, and Other Transcendental Functions - 5.4 Exercises - Page 352: 7
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