Answer
$-11 \leq f \leq 2$
Work Step by Step
$abs(2f + 9) \leq 13$
$-13 \leq 2f + 9 \leq 13$
$-13 -9 \leq 2f + 9 - 9 \leq 13 - 9$
$-22 \leq 2f \leq 4 $
$-22 *(1/2)\leq 2f *(1/2)\leq 4*(1/2) $
$-11 \leq f \leq 2$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 3 - Solving Inequalities - 3-7 Absolute Value Equations and Inequalities - Practice and Problem-Solving Exercises - Page 211: 45
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