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Andres is mailing some presents to his cousins.The rates for sending packages are shown in the table.

Weight not above (lb)


  1. What type of function would best represent this situation?

    It is a step function.

  2. Sketch a graph of the cost of a package by weight.

    It is a step function.

    First quadrant step graph, x axis labeled weight (lb), y axis labeled cost ($), with 5 horizontal steps, each with width of 1, first step is closed on both sides, rest are open on left & closed on right. The heights correspond to the y values in the table.

  3. Andres wants to mail one present that weighs pounds and another present that weighs pounds. Should he send them in one package or two separate packages?

    Compare the costs of two individual mailing and one combined mailing.