The graph of y = f(x) below gives the speed limit y along a rural highway after traveling r miles. 60 50 40 30 20 y = f(x) 10 04 8 12 16 20 Distance (miles) (a) What are the highest and lowest speed limits along this stretch of highway? (b) Estimate the miles of highway with a speed limit of 55 mph. (c) Evaluate f(4), f(12) and f(18). (d) At what r-values is the graph discontinuous? Interpret each discontinuity. Speed limit (mph)

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