C. If the first coefficient is negative, then the graph opens downwards
        
             
        
        
        
C = kmt 
k = C/mt
Units of k are Calories per pound - minute.
        
             
        
        
        
The answer is e, 3 3/4
if you add 3/4+3/4+3/4+3/4+3/4 (five times for the five batches), or did 3/4 * 5, you would get 15/4, which simplifies to 3.75, or 3 3/4
        
             
        
        
        
You can use a tangent:

We have opposite = 17 and adjacent = x.

substitute:
 cross multiply
       cross multiply
 multiply both sides by √3
     multiply both sides by √3

 divide both sides by 3
      divide both sides by 3

Use the Pythagorean theorem:

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Other method.
 triangle.
 triangle.
The sides are in the ratio 
Therefore
