In January 2016, the retail flat rate in dollars for first-class mail weighing up to 5 ounces

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In January 2016, the retail flat rate in dollars for first-class mail weighing up to 5 ounces could be computed by the piecewise-constant function P, where x is the number of ounces.image


(a) Evaluate P(1.5) and P(3). Interpret your results. 


(b) Sketch a graph of P. What is the domain of P? 


(c) Where is P discontinuous on its domain?

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