```3433_PH_SEAT_GEO.ch07_158-172
3/22/06
1:27 PM
Page 158
Answers for Lesson 7-1, pp. 368–370 Exercises
1. 1 : 1000
2. 1 : 370
3. 3b
4. 43
5. b4
6. ba
7. a3
8. 4a
9. 47
10. 73
4
11. b 1
4
15. 6.875
12. 4
13. 132
14. 4
16. 7.2
17. 7.2
18. 7.5
19. 14
20. 7
21. 125 mi
25. 18 in. by 22.5 in.
26. 13 : 6
27. 5 : 4
28. 4 : 3
29. A
30. 73
31. 94
32. 30
18
33. b2
34. Check students’ work.
35. 6
36. 32
37. 16.5
38. 6
39. 4
12
40. 19
41. 4, 3
42. 12, 256
43. 16 cm
44. 0.348 in.
45. 9; 18
46. 9; 12
47. 8; 21
48 – 51. Answers may vary. Samples are given.
48.
49.
Scale 1 cm 10 ft
Scale 1 in. 5 ft
Geometry
Chapter 7
158
3433_PH_SEAT_GEO.ch07_158-172
3/22/06
1:27 PM
Page 159
Answers for Lesson 7-1, pp. 368–370 Exercises (cont.)
50.
51.
Scale 1 in. 46 ft
Scale 1 cm 32 ft
52. Elaine did not convert units, and thought the ratios
equaled 1.
53. db or ac
54. dc or ba
55. c 1d 2d
(Symm. Prop. of ); bc
ac ac (Div. Prop. of );
57.
b
a
a
b
dc (Simplify)
bc
cd cd
(Div. Prop. of ); ac db (Simplify)
58. ba dc (Given); ba 1 dc 1 (Add. Prop. of );
a
b
c 1 d
b
bb dc dd (Subst.); a 1
b d (Simplify)
59. x 5; y 24
Geometry
60. x 3; y 15
61. x 3; y 21
Chapter 7
159
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