Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 10 - Radical Expressions and Equations - 10-6 Trigonometric Ratios - Practice and Problem-Solving Exercises - Page 649: 19

Answer

.0872

Work Step by Step

First, check that your calculator is in degrees. For a TI-84 calculator, press MODE. Then, scroll down to the third option and make sure that DEGREE is highlighted instead of RADIAN. After you have done this, return to the calculator’s home screen. Press the “cos” button, and then type in 85. Finally, press enter to get the answer: .0872.
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