10. Mike is a veterinarian. He is placing a nine-line job ad for an assistant. The following piecewise function gives the price of an x-line ad.
45
when x < 3
a(x) =
45 + 9(x – 3) when x > 3
a. Find the difference between the cost of a two-line ad and the cost of a
3-line ad.
b. Find the cost of a 10-line ad.
c. Find the cost of an 11-line ad.
d. Can you find the difference between the cost of a 15-line ad and a 17-line
ad, without finding out the cost of each ad first? Explain.