Answer
35 meters
Work Step by Step
From part a, we found $L(x)=100e^{-0.02x}$
When $L(x)=50$, $x$ is around 35.
The person can descend about 35 meters in clear water before only 50% of surface light is available.
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: 59c
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