#### Answer

w is the input with ounces as units.
P is the output with dollars as the units.
This is a function.

#### Work Step by Step

We know that w is the input because it is inside the parentheses. P is the output because it is the 'coefficient' of the parentheses. The units of ounces and dollars are both given in the problem. This is a function because every different weight of a package can only have one corresponding price.