Solve the problem.Anita receives a promotional offer from a long-distance phone company of $0.03 per minute for long-distance calls. If she spends between $9 and $24 on long distance calls in the first month, the offer will be extended by an extra month. If she spends more than $24 in the first month, the offer will be extended by an additional two months. For what range of minutes must Anita use long distance in the first month, if the offer is to be extended by an extra month?
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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.
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B. (a) 
; (b) - 4
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Mathematics