As regards being a function, the answer is Not a function - there is an input (4) that has two different outputs (14 and 16).
Why is this not a function?
A function is a mathematical relationship between two variables, where each input value corresponds to exactly one output value. In other words, for each input there is only one possible output.
In the given table, the input value 4 has two different output values, 14 and 16. This violates the definition of a function, as there are multiple possible outputs for a single input. Therefore, the given relationship is not a function.
The full question is:
Is this a function?