Answer
$$\approx 0.023.$$
Work Step by Step
We use the given decay formula:
$y=y_oe^{-0.0045t}$
Where $y_o$ is the initial amount and $t$ is the time.
By substitution, we have
$$y=y_oe^{-0.045t}=75e^{-0.045\cdot 3\cdot 60}\approx 0.023.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Appendix B - Exponential Equations - Exercise - Page 577: 26
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