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Mathematics, 09.09.2020 02:01 tatirocks1870

Recycled CDs, Incorporated, offers a choice of 5 used CDs for $21, with each additional CD costing $7. Write a cost function for purchasing 5 or more CDs. What will the cost of buying 12 CDs be? Let x represent the number of CDs over 5. please help, ive been stuck on this question for an hour without help!!!

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