Question: A basic cell phone plan costs $20 per month for 60 minutes of calls. Additional time costs $0.40 per minute. The formula C = 20

A basic cell phone plan costs $20 per month for 60 minutes of calls. Additional time costs $0.40 per minute.

The formula C = 20 + 0.40(x - 60) gives the monthly cost of this plan, C, for x minutes of calls, where x>60. How many minutes of calls are possible for a monthly cost of at least $28 and at most $40?

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SOLUTION We are given the formula for the monthly cost of the cell phone plan C 20 040x 60 where x i... View full answer

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