Exercises 1.2, page 10

1. 20
3. $- 4$ $- 4$
5. $- 3$ $- 3$
7. 6
9. $- 3$ $- 3$
11. $- 28$ $- 28$
13. 35
15. 20
17. 40
19. $- 1$ $- 1$
21. $- 32$ $- 32$
23. $- 17$ $- 17$
25. Undefined
27. 20
29. 16
31. $- 6$ $- 6$
33. $- 24$ $- 24$
35. $- 6$ $- 6$
37. $- 1$ $- 1$
39. Commutative law of multiplication
41. Distributive law
43. Associative law of addition
45. Associative law of multiplication
47. d
49. b
51. $=$ $=$
53.
1. Positive
2. Negative
55. Correct. (For $x > 0, x$ $x > 0, x$ is positive; for $x < 0, - x$ $x < 0, - x$ is positive.)
57.
1. Negative reciprocals of each other
2. They may not be equal.
59. $- 0.29$ $- 0.29$
61. $- 2.4 kW \cdot h$ $- 2.4 kW \cdot h$
63. $- 2 ° C$ $- 2 ° C$
65. 10 V
67. $100 m + 200 m = 200 m + 100 m;$ $100 m + 200 m = 200 m + 100 m;$ commutative law of addition
69. $7 (25 min + 15 min);$ $7 (25 min + 15 min);$ distributive law

..................Content has been hidden....................

You can't read the all page of ebook, please click here login for view all page.

Table of Contents for Exercises 1.2, page 10