Question

modeling real life ph is measured on a scale of 0 to 14 and refers to the concentration of an acid or base in water. the recommended ph for a swimming pool is 7.2 to 7.8. identify an inequality that represents the recommended ph of the swimming pool.

7.2 < ph < 7.8

7.2 ≤ ph ≤ 7.8

ph ≤ 7.2 or ph ≥ 7.8

ph < 7.2 or ph > 7.8

Explanation:

Step1: Understand the range meaning

The recommended pH is from 7.2 to 7.8. This means the pH can be equal to 7.2 and 7.8 as well as any value in - between.

Step2: Select the correct inequality

The inequality that represents a range including the endpoints is $7.2\leq pH\leq7.8$.

Answer:

$7.2\leq pH\leq7.8$