A-22 ANSWERS 65. Domain: R; range: > y 1 x y 22 2 4 2 6 8 f(x) 5 2 x 1 1 4 3 – 2 21, (0, 2) (1, 3) (2, 5) 67. Domain: R; range: > y 1 x y 22 2 4 6 8 y 5 4 x 1 1 4 (0, 2) (1, 5) 69. Domain: R; range: > y 0 x y 22 2 4 6 8 f(x) 5 3 x21 4 0, 1– 3 (1, 1) (2, 3) (3, 9) 71. a) 18 bags b) $205 c) 138 bags 73. a) 23.85 feet b) 66.25 feet c) 0 feet 75. a) ° 74 F b) 2 p.m. c) 4 hours or 2 p.m.; ° 75 F 77. 134.51 million 79. $16.13 81. 25 milligrams 83. a) 1.42 billion people b) 1.43 billion people 85. ≈ 6.52 grams 87. a) 23.2 cm b) 55.2 cm c) 69.5 cm REVIEW EXERCISES, PAGE 406 1. 39 2. −9 3. 15 4. 7 5. − x4 3 6. − x 12 6 7. −5 8. −31 9. −13 10. 3 11. 200 12. 210 13. 101.5 14. 25 15. = − y x2 4 16. = − + = − + y x y x 2 17 9 or 2 9 17 9 17. = w A l 18. = − = − l L wh h l L h w 2 2 or 2 19. + x 5 3 20. − q 9 15 21. + = = x x 3 7 17; 2 22. + = − = − x x x 3 8 6; 7 23. − = = x x 5( 4) 45; 13 24. + = + = x x x 10 14 8( 12); 41 25. + = x x2 15,000; bonds: $5000, mutual funds: $10,000 f) 22 23 24 25 26 27 28 21 1 4 1 3 23 21 25 26 22 x y (–1, 29) (24, 0) (2, 0) f(x) 5 x2 1 2x 2 8 2 24 g) Domain: ,R range: y 9 ≥ − 59. a) Downward b) = x 2 c) (2, 16) d) (0, 12) e) ( 2, 0), (6, 0) − f) 21 1 2 3 4 5 6 7 11 12 13 14 15 16 17 1 2 3 4 5 7 8 23 21 x y (6, 0) (22, 0) (0, 12) (2, 16) f(x) 5 2x2 1 4x 1 12 24 8 10 9 g) Domain: ,R range: ≤ y 16 61. Domain: R; range: > y 0 x y 22 2 2 4 6 8 y 5 3 x 1 – 3 21, (0, 1) (1, 3) (2, 9) 63. Domain: R; range: > y 0 x y 22 2 4 6 8 y 5 x 1 – 3 4 24 1 – 3 1, (0, 1) (22, 9) (21, 3)
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