Trigonometry (10th Edition)

Published by Pearson
ISBN 10: 0321671775
ISBN 13: 978-0-32167-177-6

Chapter 1 - Review Exercises: 47

Answer

The lifeguard will enter the water 40 yards left from the position.

Work Step by Step

As the triangles are similar: $\frac{20}{30}=\frac{x}{100-x}$ Then we just need to solve the equation for x: $20(100-x)=30x$ $2000=50x$ $x=40$
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