Answer
$A$
Work Step by Step
Step 1. The decay function is $y=y_0e^{-0.0241\ t}$
Step 2. To decay to $75\%$ of its initial amount, $y=0.75y_0$, we have $0.75y_0=y_0e^{-0.0241\ t}$ and we need to solve for $t$.
Step 3. The answer is $A$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 4 - Inverse, Exponential, and Logarithmic Functions - 4.6 Applications and Models of Exponential Growth and Decay - 4.6 Exercises - Page 479: 8
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