Answer
45%
Work Step by Step
From part a, we found $L(x)=100e^{-0.02x}$
When $x=40$, $L(x)$ is around 45.
At a depth of 40 meters, the percent of surface light available is $45\%$.
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 - 7.3 Use Functions Involving e - 7.3 Exercises - Problem Solving - Page 497: 59b
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