Question

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Answer 1

I think it shows a function

Explanation:

inputs are being changed by 10's

draw it in a table 2*10=20 2*20=40

3*10=30

4*10=40

Answer 2

It is not a function.

Explanation:

This is what we call a mapping;

Functions do not give multiple output values for a given input value;

As we can see, the input 2 produces an output of 20 and 40, therefore we can tell this is not a function.