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12. Which of these is True concerning polynomials (Select All)
A) A degree 7 polynomial can have up to 7 extrema.
B) The degree of y = 7x4 - 6x² + 4x - 1 is 7.
C) A cubic must have at least 1 real root.
D) The degree of y = (x − 2)ª (x +4)³ (x + 3)² is 9.
E) A degree 5 polynomial can have up to 5 roots.​

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