Solve the problem.The revenue achieved by selling x graphing calculators is figured to be  dollars. The cost of each calculator is  How many graphing calculators must be sold to make a profit (revenue - cost) of at least $630.00?

A. {x ? 30 < x < 42}
B. {x ? 31 < x < 41}
C. {x ? 39 < x < 51}
D. {x ? 32 < x < 40}


Answer: A

Mathematics

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