Answer: B. 6.5 > x > 8.5
Step-by-step explanation:
Given : The pH scale measures how acidic or basic a substance is.
The lower limit of pH of drinking water = 6.5
And the upper limit of pH of drinking water = 8.5
Also, Normal drinking water needs to have a pH of less than (<) 8.5 and greater than (>) 6.5.
Since the limit points not included, then the normal range of pH values of water, using a compound inequality. will be :_
[tex]6.5 > x > 8.5[/tex]
