A basic cellular phone plan costs $20 per month for 60
Chapter 0, Problem P9.109(choose chapter or problem)
A basic cellular phone plan costs $20 per month for 60 calling minutes.Additional time costs $0.40 per minute.The formula gives the monthly cost for this plan, for calling minutes, where How many calling minutes are possible for a monthly cost of at least $28 and at most $40?
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