Which of the following expressions are polynomials? Check all that apply.

Check all that apply.

A. x^3 + 2x^2

B. 2x^-3 - 5x^-1 + 3

C. 1/4 x^5 + 1/3 x^4 - 1/2 x^3

D. - 9x

E. 5/x - 1

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