What is a polynomial?

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Which of the following is a "Polynomial"?
1. $6$
  $\sqrt{3} x$
  ${x^ \frac{1}{3}}$
  $4{b^3} - 5b$
  $3x + \sqrt{4z}$
  ${x^{-4}} - 3y$
  $\frac{2}{13x} + 4$
Classifying polynomials (monomial, binomial, trinomial, or polynomial
1. $x + 2$
  $-3$
  ${x^3} -2x-4$
  ${x^3}-2 {x^2} +3 x-23$

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