Which representations are functions?

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Answer:
2) II and IV
Step-by-step explanation:
A function will have only one output value for any given input.
I. The table has two different outputs for an input of x=2.
II. The first values of the ordered pairs are all unique. This is a function.
III. The graph shows two different output values for each x input that is greater than 0.
IV. A polynomial always represents a function.
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The representations in II and IV are functions.