Real Numbers COURSE 3 CHAPTER 4 1. yes 2. no 3. yes 4. 4 5. 16 6. 48 7. composite; 2 • 32 • 5 8. composite; 24 • 33 9. prime 10. composite; 23 • 5 • 7 11. A rational number can be expressed as a ratio of two integers, , where b 0. An irrational number cannot be expressed in that way. Rational numbers are terminating or repeating decimals. Irrational numbers are non-terminating, non-repeating decimals. 12. rational 13. irrational 14. rational 15. irrational 16. rational 17. rational 18. < 19. < 20. > a b = / 4-A

Real Numbers COURSE 3 CHAPTER 4 1 4 21. = 22. 0.400 23. –3.375 24. 1.267 25. 0.636 26. 27. 28. 29. 30. 27 in. 31. 4 mi 32. – 33. – 34. 35. 36. 37. –1 38. –2 39. –1 40. – 41. –3 42. – 43. 1 44. –1.2, –0.45, , 45. –1, – , , 0.22 46. –1 47. – 1 2 7 20 14 15 3 5 1 3 25 36 35 36 16 25 7 12 5 11 99 45 1 6 3 13 44 202 2 3 2 15 1 3 471 1,000 4 9 3 20 94 333 4-A

Real Numbers COURSE 3 CHAPTER 4 35 81 48. 49. –4 50. 12, –12 51. 16, –16 52. 10 53. 0 54. –1 55. 4 56. 16 57. 13 58. 36 59. no; 302 + 702 802 60. yes; 42 + (4.2)2 = (5.8)2 61. yes; 102 + 242 = 262 62. no; 2.52 + 3.52 4.52 = / = / 4-A