Refer to Problem 75. Write a brief verbal comparison of the two services described for calls lasting more than 20 minutes.
Problem 75
A long-distance telephone service charges $0.99 for the first 20 minutes or less of a call and $0.07 per minute for each additional minute or fraction thereof.
(A) Write a piecewise definition of the charge F(x) for a long-distance call lasting x minutes.
(B) Graph F(x) for 0 (C)

Transcribed Image Text:

Find lim. F(x)lim)d lim F(x), whichever exist. →20 エー+20 ,20