Solve the problem.The revenue achieved by selling x graphing calculators is figured to be 
The cost of each calculator is 
How many graphing calculators must be sold to make a profit (revenue - cost) of at least $40.80?
A. {x ? 6 < x < 34}
B. {x ? -4 < x < 24}
C. {x ? 8 < x < 32}
D. {x ? 7 < x < 5}
Answer: A
Mathematics
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?
?
A. ?
B. ?
C. ?
D. ?
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A. -6
B. 
C. 2
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