Telephone rates. A long-distance telephone service charges $0.99 for the first 20 minutes or less of a call and $0.07 per minute thereafter.
(A) Write a piecewise definition of the charge F(x) for a long-distance call lasting x minutes.
(B) Graph F(x) for 0 < x ≤ 40.
(C) Find , whichever exist.
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