Question

Find the domain and range of the relation and determine whether it is a function.

Answer 1

The domain is all of the x - values, while the range is all of the y - values. If there are two point with the same x - values, then it is not a function. Therefore, your answer would be A.
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Answer 2

Domain (ur x values) are {-4,-1,1,4}
range (ur y values) are {-1,1,4}..if u have repeating numbers, u only have to write them once
yes, this is a function because there are no repeating x values