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

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

b. graph G(x) for 0

c. find lim G(x), lim G(x), and lim G(x)
x->10^- x->10^+ x-10