Answer
$\approx6967$
Work Step by Step
Plugging in $R=5$ into the given formula: $5=100e^{-0.00043t}\\0.05=e^{-0.00043t}\\\ln0.05=-0.00043t\\t=\frac{\ln0.05}{-0.00043}\approx6967$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 7 Exponential and Logarithmic Functions - 7.6 Solve Exponential and Logarithmic Equations - 7.6 Exercises - Problem Solving - Page 521: 57
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