Building a Step Function
 Ceiling
 Greatest Integer
 Graphing
 Modeling


 Dime a Minute?  
What factors are important when determining the price of a phone call? How do you distinguish the price of a five minute call versus a five and onehalf minute call? How do phone companies use functions to determine your local phone bill?
Follow each step in Building a Step Function to investigate these questions.
[introduction] [step functions] [scenarios] [telephone bill] [grading scale]
