Precalculus

A-4 Answers Section 1.557.Wage (dollars)Approximately $3.89 in 1991 (answers may vary), which is $0.36below the actual value of $4.2559. 117 2 12.82 blocks traveling on Lloyd Avenue from point Ato the point (3, 4) and then right to point B; 17 blocks traveling frompoint A to the point (5, 2) and then to point B.61. 300-5-50Approximately 199463. 90,000-2$6.00$5.00$4.00$3.00$2.00$1.00$0.00 1950 1960 1970 1980 1990 2000 2010–10,000Approximately 199365. a. x 2 (y 35) 2 30 2 b. Approximately 63.3 feet67. False 69. FalseSection 1.5, page 781. x 2 3. m 15 5. w 952137. a 3, a 4, a 6 9. x 3, x 2, x 211. s 0, s 3 13. y 1 3 15. u 217. y 10 19. s 6 21. No solution23. x 5 27 25. x 9 27. x 7 29. t 1 842 231. x 4 33. x 3 35. x 237. w 2 i39. m E 41. r A 43.c 2P 1t d 1 d 2d 2 d 145. 47. R 1 RR 2t v 0 v0 2 64s 64s 032R 2 R49. x 1.5 51. x 1.0, x 2.0 53. x 0.7555. x 11.99, x 11.99 57. y 4 3x; x 1.33451659.61.y x 2 2x 15 x 3.18, x 1.184 ;y 1 1 2x 6; x 5263. 97 65. 2 hours 45 minutes after the second car leaves67. Approximately 9.5 seconds 69. Approximately 19.8 miles71. September 199873. a.1 2t 0.1 second b. t 2 3 0.07 second4475. a. s dhl hb. s 110 feet23 4.7877. a. 6 hours b. 5 1 hours3c. 13 1 hours379. 26 2 miles per hour 81. True 83. True3Section 1.6, page 921.3.5.7.9.11.13.15.(, 13)(1, ) 1 4 , )(, )( 4 3 , )(2, 6) 1, 3 2 3, 9 2 5 2) , 17.1 2 3 4 5 6 7 8 919. x 6 21. u 2, u 3 23. No solution25. (3, 3) 27. (, 12) (12, ) 29. [3, 7]31. ( 7 33. 35. ( 1 6 , 3 2 , 9 2)2)37. x 1 5; (4, 6) 39.41.10-106 7 8 9 10 11 12 13 14–3 –2 –1 0 1 2 3 4 5–3 –2 –1 0 1 2 3 4 5–4 –3 –2 –1 0 1 2 3 4–2 –1 0 1 2 3 4 5 6–3 –2 –1 0 1 2 3 4 5 6 7]–1 0 1 2]]1 2 3 4 5 6 7]] 1, 7 3] 2x 3 6; (, 9 2) ( 3 2 , )-10The x-intercepts; x-values where y is positive,x-values where y is negative43. x 2.4, x 6 45. [3, 1] 47. [5, 1]49. (22, 22) 51. Approximately (, 1.22) (0.72, )53. (, 1) 55. x 3 57. [2, 0] [2, )2 , x 2 759. From 141.15 to 205.26 miles10