Consider a function machine that accepts inputs as ordered pairs. Suppose the components of the ordered pairs are natural numbers and the first component is the length of a rectangle and the second is its width. The following machine computes the perimeter (the distance around a figure) of the rectangle. Thus, for a rectangle whose length, l, is 3 and whose width, w, is 2, the input is
a. For each of the following inputs, find the corresponding output:
b. Find the set of all the inputs for which the output is 20.
c. What is the domain and the range of the function?
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