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Are the following functions? Justify your answer. 1. f(x) = x with domain and codomain R. 2. g(x) = 2x + 1 with domain

Are the following functions? Justify your answer. 1. f(x) = x with domain and codomain R. 2. g(x) = 2x + 1 with domain and codomain Q. 3. h(r) = tx with domain and codomain Z. 4. u(x)=x with domain and codomain N.

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