Provide an appropriate response.A welder analyzed his account records and discovered that his profit could be predicted by the formula P = -x2 + 80x - 1500, where x represents the number of welds he could do daily. How many welds should he do daily to maximize his profits?
Fill in the blank(s) with the appropriate word(s).
40 welds
Mathematics
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, - 
? x ? 
A. 
B. 
C. 
D. 
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A. 
B. - 
C. - 
D. 
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