Answer
$68\leq F\leq86$
Work Step by Step
The Fahrenheit to Celsius formula is:
$C=5/9(F-32)$.
We use this formula to convert the inequality to Fahrenheit:
$20 \le C \le 30 \\ 20\leq 5/9(F-32)\leq30\\36\leq F-32\leq54\\68\leq F\leq86$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 1, Equations and Graphs - Section 1.7 - Solving Inequalities - 1.7 Exercises - Page 149: 79
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