By definition we have to: A mathematical function is a relationship that is established between two sets, through which each element of the first set is assigned a single element of the second set or none. The initial set or starting set is also called the domain; the final set or set of arrival, meanwhile, can be called codomain. We have the following information: {(-5.2), (-2.5), (0.7), (0.9)} The data does not represent a function because two different values of the range belong to an element of the domain: (0.7) (0.9) Answer: The relation is not a function.
