Question

recycled cds incorporated, offers a choice of 5 used cds for $26, with each additional cd costing $4. write a cost function for purchasing 5 or more cds. what will the cost of buying 6 cds be ? let x represent the number of cds over 5.

Answer 1

If $26 represents the cost of  the 5 used CDs, than your formula would be "26+4x" ,x being the amount of extra CDs you purchase.


The number CDs minus 5 is our x value, because the first 5 are the used CDs bundled into the $26 group.

26+4(6-5)
26+4(1)
26+4
30

6 CDs would cost $30