Which of the following are polynomial functions? check all that apply. a. f(x) =3/5x^4 -18x^2 +5-10/x^2 b. f(x) = -x^3+5x2 +7square rooot x-1 c. f(x) = x^-2 + 15x-3 d. f(x) = 5.3x ^2+ 3x - 2 e. f(x) = 4x^4-10

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