Question

A local newspaper charges $13 for each of the first four lines of a classified ad, and $7.50 foreach additional line. Express the cost of a -line ad, c(x), as a piecewise function

Answer 1

The cost is the basic cost increased by the product of the number of extra lines and the price per additional line, then:

Let x be the number of additional lines

c(x)=13+7.50x