Question

a mapping diagram represents a relationship that contains 3 different input values and 4 different output values. Is the relationship a function?

Answer 1

It (does not) represent a function. For the input values to be paired with all four output values, (at least one) of the input values would be paired with (more than one) output value.

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Answer 2

No.

A function has one output value for a given set of inputs.