Camile has a plan for her cell phone in which she pays a
fixed rate for calls and a certain amount for each text
message sent. When she sent 300 messages, her total
bill was $22.75, and when she sent 550 message, her
total bill was $29.
Part A: What is the cost per message?
Part B: What is the cost of the flat rate?
Part C: Express, in function notation, the total cost
based on the number of messages sent.
