Answer
$13$ days
Work Step by Step
Plugging in $m=5$ into the equation, we obtain:
$5=15e^{-0.087t}\\1/3=e^{-0.087t}\\\ln(1/3)=-0.087t\\t=\frac{\ln(1/3)}{-0.087}\approx13$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 4, Exponential and Logarithmic Functions - Section 4.5 - Exponential and Logarithmic Functions - 4.5 Exercises - Page 405: 95
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