The acceptable pH range for a swimming pool is between 7.2 a...

Question

The acceptable pH range for a swimming pool is between 7.2 and 7.8. Which of the following inequalities represents this statement?

A

x < 7.2 or x ≥ 7.8

B

x ≤ 7.2 or x > 7.8

C

7.2 ≤ x ≤ 7.8

D

7.2 < x < 7.8

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