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Answer:
A.) 5, 10, 15
Explanation:
The domain of a function is the set of all possible inputs for the function. For example, the domain of f(x)=x² is all real numbers, and the domain of g(x)=1/x is all real numbers except for x=0.
Domain are the x's in an ordered pair and it is usually the left side of diagrams. So everything on the left is a domain. So 5,10,15 is correct.