Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

Published by Pearson
ISBN 10: 0-32193-104-1
ISBN 13: 978-0-32193-104-7

Appendix A - Review - A.1 Algebra Essentials - A.1 Assess Your Understanding - Page A13: 144

Answer

a. acceptable. b. not acceptable.

Work Step by Step

The formula that describes the acceptable voltage is $$ |x-220|\leq 8$$ We plug in the given voltage values and if the inequality proves true, then the voltage is acceptable. a. Since $|214-220|=6\le 8$, then the voltage of $214$ Volts is acceptable. a. Since $|209-220|=11\gt 8$, then the voltage of $209$ Volts is not acceptable.
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