9. $\left\{\pm {\displaystyle \frac{1}{3}},\pm 1,\pm {\displaystyle \frac{5}{3}},\pm 5\right\}$

11. $\left\{\pm {\displaystyle \frac{1}{4}},\pm {\displaystyle \frac{1}{2}},\pm {\displaystyle \frac{3}{4}},\pm 1,\pm {\displaystyle \frac{3}{2}},\pm 2,\pm 3,\pm 6\right\}$

13. $\{-2,1,2\}$

15. $\{-1\}$

17. $\left\{-3,{\displaystyle \frac{1}{2}},2\right\}$

19. $\left\{{\displaystyle \frac{2}{3}}\right\}$

21. $\left\{-{\displaystyle \frac{1}{3}}\right\}$

23. $\{-1,2\}$

25. $\{-3,-1,1,4\}$

27. No rational zeros

29.

31.

33.

35. Number of positive zeros: 0 or 2; number of negative zeros: 1

37. Number of positive zeros: 0 or 2; number of negative zeros: 1

39. Number of positive zeros: 1 or 3; number of negative zeros: 0 or 2

41. Number of positive zeros: 1 or 3; number of negative zeros: 1

43. Number of positive zeros: 0; number of negative zeros: 0

45. Number of positive zeros: 0; number of negative zeros: 0

47. Number of positive zeros: 1; number of negative zeros: 0

49. Upper bound: ${\displaystyle \frac{1}{3}}$; lower bound: $-1$

51. Upper bound: 1; lower bound: $-3$

53. Upper bound: 31; lower bound: $-31$

55. Upper bound: 4 lower bound: $-4$

57. $\{1,-3+\sqrt{11},-3-\sqrt{11}\}$

59. $\left\{-\sqrt{3},{\displaystyle \frac{1}{2}},\sqrt{3}\right\}$

61. $\left\{{\displaystyle \frac{1}{2}},2-\sqrt{3},2+\sqrt{3}\right\}$

63. $\{-2,-\sqrt{3},1,\sqrt{3}\}$

65. $\left\{-1,1,{\displaystyle \frac{3+\sqrt{5}}{2}},{\displaystyle \frac{3-\sqrt{5}}{2}}\right\}$

67. $\left\{-\sqrt{3},{\displaystyle \frac{1}{2}},\sqrt{3},2\right\}$

69. $\left\{-\sqrt{2},-{\displaystyle \frac{1}{3}},{\displaystyle \frac{1}{2}},\sqrt{2}\right\}$

71. $\{-\sqrt{3},-1,1,\sqrt{3},2\}$

73. $\left\{-2,-\sqrt{3},{\displaystyle \frac{1}{2}},1,\sqrt{3}\right\}$

75. $\left\{-{\displaystyle \frac{1}{2}},1,2,3\right\}$