Question: 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

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 of x for 0 ≼ x ≼ 600.

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