A store sells cds at one price and dvds at another price


Question: A store sells CDs at one price and DVDs at another price. Figure shows the revenue (in dollars) of the music store as a function of the number, c, of CDs and the number, d, of DVDs that it sells. What is the price of a CD? What is the price of a DVD?

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Mathematics: A store sells cds at one price and dvds at another price
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