Equivalent expressions of functions Telephone rates The TeleTone, ClearCom and FunPhone cellular companies anounced their reduced rates: TeleTone: 20 minutes of free calls per month and a fee of 10 cents for reach additional minute. ClearCom: A fee of 10 cents per minute, with $2 off the final bill. FunPhone: Pay $1 for the first 30 minutes of calls, and 10 cents for each additional minute. Construct correspondence rules to describe the dependence of the monthly payement for each company on the number of minutes a person talks on the phone. A newspaper article claimed that three companies are in fact offering the same rate. Discuss the validity of this claim.

The form f(x)=ax+b The form f(x)=a(x-c) The form f(x)=a(x-c)+m Emphasizing information Emphasizing intersections Families of functions Features from value-tables Partial pictures Equivalent recipes Telephone rates Verbal descriptions of equivalent expressions Stories Describing a trip Speeding car Exercise 1 Exercise 2 Exercise 3 Exercise 4 Exercise 5 Exercise 6 Exercise 7 Exercise 8 Exercise 9 Exercise 10 Exercise 11 Exercise 12 Exercise 13 Exercise 14 Exercise 15 Exercise 16 Exercise 17 Exercise 18 Exercise 19