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Which mapping does not represent a function?

Which mapping does not represent a function?-example-1
User AmbGup
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Answer: C

Explanation:

For any function, a value plugged in (x) cannot have more than 1 outcome (y). C states that when x = 10, y has 2 values; 30 and 35. This means C is not a function.

User Abraham Covelo
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