Functions Modeling Change: A Preparation for Calculus, 5th Edition

Published by Wiley
ISBN 10: 1118583191
ISBN 13: 978-1-11858-319-7

Chapter 7 - Trigonometry and Periodic Functions - Exercises to Skills for Special Angles - Page 325: 24



Work Step by Step

Using trigonometry, we find: $$\cos \left(45^{\circ \:}\right)=\frac{10}{x} \\ \frac{\sqrt{2}}{2}x=10 \\ x=10\sqrt{2}$$
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