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Problem 2. [7 points] Consider the function f : Q -> Q defined by f(x) = 2x + 5. (a) [3 points] Is f an

Problem 2. [7 points] Consider the function f : Q -> Q defined by f(x) = 2x + 5. (a) [3 points] Is f an injection?\f(c) [1 point] Is f a bijection

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