ANSWERS A-17 47. a) 2015, 2016 b) 2020, 2021 c) 2014, 2017, 2018, 2019, 2020, 2021 d) None 49. 11 months 51. 60 minutes 53. $1000 55. < < t 0.5 1.5 57. 96% or higher 59. ≤ ≤ x 6.875 11 61. The student’s answer is ≤ − x 12, whereas the correct answer is ≥ − x 12. Yes, −12 is in both solution sets. SECTION 6.6, PAGE 348 1. Graph 3. x 5. Plotting points, using intercepts, and using the slope and the y-intercept 7. m For odd Exercises 9–15, see the following figure. 2 4 15 9 11 13 6 22 x 24 26 2 4 6 y 24 26 22 For odd Exercises 17–23, see the following figure. 2 6 x 22 24 26 2 4 6 y 23 19 21 17 24 26 22 25. (0, 2) 27. −( 2, 0) 29. − − ( 3, 4) 31. (2, 2) − 33. (2, 2) 35. (0, 2), (3, 0) 37. ( ) (8, 7), , 0 10 3 39. (4, 3) 41. (8, 0), (0, 3) 43. y 5 x 1 1 4 2 24 2 4 22 24 (2, 3) (0, 1) (21, 0) x y 22 45. (1, 1) (0, 21) (21, 23) 4 2 24 22 2 4 24 y 5 2x 2 1 x y 22 47. 22 2 4 6 22 x 24 2 4 6 y (0, 6) (1, 3) (2, 0) y 1 3x 5 6 49. x y 2 22 2 4 24 22 4 6 y 5 x 1 4 (2, 5) (0, 4) (22, 3) 1– 2 41. a) = p kn b) $1012.50 43. a) = t k T b) 1.875 minutes 45. a) = I k R b) 10 amperes 47. a) = d kt2 b) 144 ft 49. a) = W kI R2 b) 9 watts 51. a) = R kL A b) 25 ohms 53. a) N kp p d 1 2 2 = b) 63,000 calls 55. Answers will vary. 57. a) Directly b) 0.5 59. a) y will double. b) y will be half as large. 61. 1 9 SECTION 6.5, PAGE 336 1. Inequality 3. Compound 5. All 7. Closed 9. 4 11. 25 24 23 22 21 0 4 5 1 2 3 13. 25 15. 25 24 23 22 21 0 4 5 1 2 3 17. 26 0 19. 29 21. 4 0 23. 22 21 0 1 2 3 7 8 4 5 6 25. 21 0123456789 27. 25 24 23 22 21 0 4 5 1 2 3 29. No solution 0 31. 25 24 23 22 21 0 All real numbers 4 5 1 2 3 33. 25 24 23 22 21 0 4 5 1 2 3 35. 3 21 37. 6 10 39. 25 24 23 22 21 0 4 5 1 2 3 41. 25 24 23 22 21 0 4 5 1 2 3 43. 25 24 23 22 21 0 4 5 1 2 3 45. 22 21 0 1 2 3 7 8 4 5 6
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