Help me complete exercises 10, 12, 14, 18, 20, 22 please.

EXERCISES Practice List the possible rational roots of each equation. Then determine the rational roots. 10. x3 + 2x2 - 5x - 6 = 0 11. x3 - 2x2 + x + 18 =0 12. x4 - 5x3 + 9x2 - 7x + 2 =0 13. x3 - 5x2 - 4x + 20 = 0 14. 2x4 - x3 - 6x + 3 =0 15. 6x4 + 35x3 - x2 - 7x - 1 =0 16. State the number of complex roots, the number of positive real roots, and the number of negative real roots of x - 2x + 7x2 + 4x - 15 = 0. Find the number of possible positive real zeros and the number of possible negative real zeros for each function. Then determine the rational zeros. 17. /(x) = x3 - 7x - 6 18. /(x) = x3 - 2x2 - 8x 19. /(x) = x3 + 3x2 - 10x - 24 20. A(x) = 10x3 - 17x2 - 7x + 2 21. Ax) = x+ 2x3- 9x2 - 2x + 8 22. A(x) = x4 - 5x- + 4