Answer
$k=-0.0396$ decay rate or $3.96\%$ decay per day
Work Step by Step
$A=A_{0}e^{kt}$
For $A=0.5, A_{0}=1, t=17.5 $ days
$0.5=1e^{17.5k} $
$\ln0.5=17.5k $
$k=-0.0396$ decay rate or $3.96\%$ decay per day
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 9 - Section 9.6 - Exponential Growth and Decay; Modeling Data - Exercise Set - Page 741: 25
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