A phone company set the following rate schedule for an m-minute call from any of its pay

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A phone company set the following rate schedule for an m-minute call from any of its pay phones.
A phone company set the following rate schedule for an

a. What is the cost of a call that is under six minutes?
b. What is the cost of a 14-minute call?
c. What is the cost of a 9 1 / 2 minute call?

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