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Answer:Step-by-step explanation:By definition, a relation is a function if and only if each input value have one and only one output value.The input values are the x-values and the output values are the y-values.Given the function f(x):You need to substituteinto this function:And now you must evaluate in order to find the corresponding output value.You get:The function g(x) is:Then, you need to substitutein the function:And finally you must evaluate in order to find the corresponding output value. This is:...