Answer
$|F-730|\le 50$
Work Step by Step
Step 1. Given $680^\circ F\le F \le 780^\circ F$, find the mean value as $\frac{680+780}{2}=730$
Step 2. Half of the range is $\frac{780-680}{2}=50$, thus we can write $|F-730|\le 50$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 1 - Equations and Inequalities - 1.8 Absolute Value Equations and Inequalities - 1.8 Exercises - Page 168: 79
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