15 The graph below shows the total cost of cable service to new customers for the first five
months.
Total Cost of Cable Service
180
170
160
150
140
130
120
110
100
90
80
70
40
1 1 2 3 4 5
Months of Service (m)
Based on the data in the graph, which of the
following expressions can be used to represent
the total cost of cable service for m months?
A 10 m+ 30
10 m + 40
с 40 m - 10
D 40 m - 30
B