Telephone rates. A second long-distance telephone service charges $0.09 per minute for cal...

Telephone rates. A second long-distance telephone service charges $0.09 per minute for calls lasting 10 minutes or more and $0.18 per minute for calls lasting less than 10 minutes.

(A) Write a piecewise definition of the charge G(x) for a long-distance call lasting x minutes.

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(B) Graph G(x) for 0 < x ≤ 40.

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(C) Find , whichever exist.