Solve the problem.The price p and the quantity x sold of a certain product obey the demand equation p = - 
x + 120, 0 ? x ? 840.What quantity x maximizes revenue? What is the maximum revenue?
A. 840; $25,200
B. 210; $18,900
C. 420; $25,200
D. 630; $18,900
Answer: C
Mathematics
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?
?
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A. 7
B. 1
C. -7
D. 
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Solve the systems of equations by the addition method. 
A. 
B. {(7, 28)}
C. no solution; ?
D. {(2, 4)}
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Find the commission earned or the rate of commission. Round money answers to the nearest cent if necessary.Sales: $610 Commission: $27.45
A. 6.5% B. 5.5% C. 0.45% D. 4.5%
Mathematics