Answer:
D. the length of the quarter
Explanation:
Given Patrick started playing 4 minutes into the 2nd quarter, and played until the end of the 3rd quarter, you want to know how long Patrick played.
Quarter
If q is the length of a quarter, Patrick's playing time is ...
2q -4 . . . . minutes
In order to give this a numerical value, we need to know the value of q.
The most important variable to the problem is ...
D. the length of a quarter.
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