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The compound inequality that describes skis with lengths of 120 to 140 cm inclusive is given by:
[tex]120 \leq l \leq 140[/tex]
[tex]a \leq x \leq b[/tex]
In this problem, we want the length l to be at least 120 cm and at most 140 cm, hence:
[tex]120 \leq l \leq 140[/tex]
You can learn more about compound inequalities at https://brainly.com/question/24528399