Answer
$12.61$ years half-life
Work Step by Step
$A=A_{0}e^{kt}$
For $A=0.5, A_{0}=1, k=-0.055$
$0.5=1e^{-0.055t} $
$\ln0.5=-0.055t $
$t=12.61$ years half-life
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: 21
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