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Determine whether each of these functions is a bijection from$R$ to $R.$

  1. $f(x) = -3x+4$
  2. $f(x) = -3x^2+7$
  3. $f(x) = (x+1)/(x+2)$
  4. $f(x) = x^5+1$
in Set Theory & Algebra
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only a and d

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