Answer
$-11 \leq f \leq 2$
Work Step by Step
Given: $|2f+9| \leq 13$
$2f+9 \leq 13$ or $2f+9\geq-13 $
$2f \leq 4$ or $2f \geq -22$
$f \leq 2$ or $f \geq -11 $
$-11 \leq f \leq 2$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 3 - Solving Inequalities - 3-7 Absolute Value Equations and Inequalities - Practice and Problem-Solving Exercises - Page 211: 45
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