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Selected AnswersforCore Connections, Course 2

Lesson 1.1.11-3.All responses vary.1-4.All responses vary. They all have at least one obtuse angle or they are all polygons.1.5.a: 17 mmb: sort segment: 17 mm, long segment: 30 mm1-6.All responses vary.Lesson 1.1.21-11. a: P 20.5 in., A 15 in.2b: P 61.4 cm., A 210 cm2c: P 22 yds, A 21 yds21-12. a: All responses vary.b: All responses vary.1-13. a: Event 2: All responses vary.b: Event 2: All responses vary.1-14.1-15. a: 3b: Explanations vary. Possible explanations: Guess and check or worked backwards bysubtracting and dividing.2Core Connections, Course 2

Lesson 1.1.31-18. 71-19. a: 79b: 1.5c: 231-20. a: 30 feet. 150 feet. 450 feet.b: 50 stories1-21.34is equivalent to1216, so it is greater than1116 .1-22. a: P 18 un., A 9 un.2b: P 24 ft., A 28 ft2c: P 46 cm, A 120 cm2Lesson 1.1.41-35. Median is 82.1-36. a: 84 inchesb: 36 inches1-37. a:b:2c:–147414–5 0628d:–4000 –5 10 152000 40001-38. 10.501-39. No. She needs 1.00 more.Selected Answers3

Lesson 1.1.51-45. 12345 ! 9 6 111111 , 123456 ! 9 7 1111111 , 1234567 ! 9 8 11111111 ,12345678 ! 9 9 111111111 , 123456789 ! 9 10 1111111111a: Patterns include: added number increases by 1, first factor in the multiplication addsanother digit, the next consecutive number, answers constantly add a digit of one asthey increase.b: Answers vary.1-46. a:14or 25%b: 1 12 or 150% ORc:2334or 75% depending on how you see the “whole”or ! 66.7%1-47. a: two-thirdsb: one whole and one-eighthc: six-ninths1-48. 3.151-49. a: P 34.5 in., A 47 in2b: P 26.5 mm., A 24 mm2Lesson 1.2.11-57. a: Strawberry1-58.b:0.01150.825%01-59. a: T1b: Ec: E1-60. a: i: 80%, ii: 12.5%, iii: 10%d: Tb: i:810ore: T80100or 45 , ii:f: E12.5100or 18 , iii:101001or 101-61. Mean 14 cm, Median 14 cm1-62. a: Only that it is between 70 and 75 mphb: Possible answers: 50-55 mph OR 50-65 mphc:4216 18Core Connections, Course 2

Lesson 1.2.21-70. Most credible prediction: 2 purple, 3 orange, 1 yellow, 4 green1-71. a: 3612b:46 231-72. Estimate: 8 per week for 10 weeks is 80, 40 more is 120, so about 15weeks; 125 7.75 16.13 weeks, so 17 weeks1-73. 3 feet, 6 feet, 12 feet1-74. a: 20, 40, 80b: 15, 30, 45, 75c: 25, 50, 75, 125d: 50, 150, 200, 250Lesson 1.2.31-80. a: 41213b: 281-81. a: Make sure that half of the stuffed animals are teddy bears.b: Possible response: Add 8 teddy bears or remove 8 of the other animals.1-82. All responses vary.1-83. a: 1100 yardsb: 1819 times1-84. a: P 44.85 m, A 117 m2b: P 30 m, A 18 m2Lesson 1.2.41-90. a: 40%1-91. a:b:1415b:45100or92020 120c: 1 100100d: 52.5%, 0.25, 25%, 0.2, 20%c: Before the other coins are added.1-92. a: 8b: 12c: 41-93. 2.20, 11.00, 0.551-94. a:524Selected Answersb:75or 1 25c:16455

Lesson 1.2.54021-103. a: Yes, 10of 5 squares,25 100 5 . The shape can be rearranged and divided into groups 10each with 2 shaded; both the numerator and denominator of the fraction 25 can bemultiplied by 15 .b:4101-104. 12. 12 2 6,!6 ! 4 21-105. a:141-106. a:48, 25%or121-107. a: 25b:1850b:3120, 36%c: 1 12 , 150%or 1 1120c:b: 451635c: 30Lesson 1.2.61-114. a:c:1-115. a:5!36 31!82 828 1518b:8 16d: 58 2!23 21!64 6 4662478b: 4 is a factor of 8, so 8 can be a common denominator.1-116. a: 301-117. –2, 0, 0.4,1-118. a:61415b: 2412,58, 1.1,53, 2b:1714 1 143c:2048 10245 12Core Connections, Course 2

Lesson 1.2.71-124. 50%1-125.34, Explanations vary.1-126. a: x 13b: x 87c: x 181-28. a:b:c:d:e:f:d: x 501-27. (2,1) (4,7) (6,1)1-29. a: P 196 in., A 2052 in.2b: P 221 cm, A 2044 cm2Lesson 1.2.81-137. Answers will vary.a:c:2 ,3616 ,12 , etc.1812 , etc.32b:d:22242014,,55 , etc.601 73 , etc.1-138. 1 581-139. a: 1.5 muffinsb: Each person gets half a muffin.1-140. C1-141. a: A 96 cm2, P 40 cmc: A 144 cm2, P 52 cmSelected Answersb: A 22 in.2, P 25.05 in.d: A 696.67 m2, P 114.67 m7