The graph of y = f(x) gives the speed limit y along a rural highway x miles

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The graph of y = f(x) gives the speed limit y along a rural highway x miles from its starting point at an intersection. 


(a) What are the maximum and minimum speed limits along this stretch of highway? 


(b) Estimate the miles of highway with a speed limit of 55 miles per hour. 


(c) Evaluate f(4), (12), and f(18). 


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

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