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I don't know how to start this question Problem 4 (2 pts.): Which of the functions listed below is a bijection from R to R

I don't know how to start this question

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Problem 4 (2 pts.): Which of the functions listed below is a bijection from R to R (provide explanations): f(x) = x5 4x g(x) = x + 4x, h(x) = e", k(x) = ln(e)

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