Recycled CDs, Incorporated, offers a choice of 5 used CDS for $20, with each additional CD costing $4. Write a cost function for purchasing 5 or more CDs. What will the cost of buying 13 CDs be? Let x represent the number of CDs over 5.
C(x) = _____
Please help asap! This is due today and I feel confused. Tysm!
How to find the Cost Function?