Provide an appropriate response.
-The percent of concentration of a acid absorbed in a new manufacturing process after x hr after the acid has been mixed is given by 
How long after the acid has been added is the concentration a maximum?
Round answer to the nearest tenth, if necessary.
A) 2.5 hr
B) 4.9 hr
C) 4 hr
D) 7 hr
Correct Answer:
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