Question: 64. A cell phone plan has a basic charge of $35 a month. The plan includes 400 free minutes and charges 10 cents for each

64. A cell phone plan has a basic charge of $35 a month. The plan includes 400 free minutes and charges 10 cents for each additional minute of usage. Write the monthly cost C as a function of the number x of minutes used and graph C as a function ofx for O s; x a 600

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