In Exercises 19-24, use the Leading Coefficient Test to determine the end behavior of the graph of the polynomial function. 19. f(x) = 5x + 7x? – x + 9 20. f(x) = 11.x - 6x? + x + 3 21. f(x) = 5x4 + 7x2 - x + 9 22. f(x) = 11x – 6x? + x + 3 23. f(x) = -5xr + 7x? - x + 9 24. f(x) = -11x – 6x2 + x + 3

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