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Recycled CDs, Incorporated, offers a choice of 5 used CDs for $20, with each additional CD costing $7. Write a cost function for purchasing 5

Recycled CDs, Incorporated, offers a choice of 5 used CDs for $20, with each additional CD costing $7. Write a cost function for purchasing 5 or more CDs.

What will the cost of buying 8 CDs be?

Let x represent the number of CDs over 5 .

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