Checking Analytic Skills Use the graphs to answer each item....

Checking Analytic Skills Use the graphs to answer each item. Do not use a calculator.

Speed Limits The graph of y = ƒ(x) gives the speed limit y along a rural highway after traveling x miles.

(a) What is the speed limit at the 4-mile mark?

(b) Estimate the miles of highway with a speed limit of 30 mph.

(c) Evaluate ƒ(5), ƒ(13), and ƒ(19).

(d) At what x-values is the graph discontinuous? Interpret each discontinuity.