Swimming pools must have a certain amount of chlorine content. the united states standard for safe levels of chlorine in swimming pools is at least 1 part per million and no greater than 3 parts per million. write a compound
inequality for the acceptable range of chlorine levels.

1 ≤ c ≤ 3

Step-by-step explanation:

In order to meet the standard, the chlorine level (c) must be at least 1 part per million (equal to or greater than 1):

1 ≤ c

At the same time, the level also needs to be no greater than 3 parts per million (equal to or lesser than 3)

c ≤ 3

Combining both inequalities yields (in parts per million):

1 ≤ c ≤ 3.

The compound inequality above describes the acceptable range for chlorine levels.

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