$-11 \leq f \leq 2$
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 $ $-11 \leq f \leq 2$
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