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

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

   Partial Answer (a):

   It is a step function.

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

   Hint (b):

   It is a step function.

   Answer (b):

   

3. Andres wants to mail one present that weighs $2.2$ pounds and another present that weighs $1.8$ pounds. Should he send them in one package or two separate packages?

   Hint (c):

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