Question 1154984
The problem describes a practical situation.  One of those choices makes better, the best sense compared to the other choices.  



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The domain is the number of weeks and can be any real number. 
The domain is the number of weeks and can be any positive real number. 
The domain is the number of weeks and can be any real number between 0 and 27.5. 
The domain is the number of weeks and can be any real number between 0 and 55.
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If starts with 55 gallons and use 2 gallons each week, then you know:
TIME will not be negative;
time will be limited according to that "55 gallon" starting volume;


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