In Activities 1 through 4, for each of the relations
a. identify the representation of the relation as numerical, algebraic, verbal, or graphical.
b. state the descriptions and units of measure for both the input and output variables.
c. indicate whether the relation is a function.
d. if the relation is a function, draw an input/output diagram, or if the relation is not a function, explain why not.
Phone Recycling Mobile phone recycling can be modeled as
recycled during the xth year since 2004, 0 ≤ x ≤ 4.
(Source: Based on data from www.recellular.com )
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