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how many feet of cabinet are made when the cost is $441?

The cost (in dollars) of making n feet of cabinet is represented by C = 18n + 45

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Susan L. | Tutor in Math and Science--Patient, Proficient, OrganizedTutor in Math and Science--Patient, Prof...
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The equation you have represents the cost for n feet of cabinet. If you know what the cost is C, you can solve for n.
 
The cost is given as $441. Plug into equation.
 
441 = 18n + 45
 
Subtract 45 from both sides
 
396 = 18n
 
Divide by 18 to get n
 
22 = n
 
The answer is 22 feet of cabinet.