# Selected Answers for Core Connections, Course 3

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1 Selected Answers for Core Connections, Course 3

3 Lesson a: Answers will var. b: 3 c: a: 1, b: 0, c: 4, d: 4, e: 0, Answers will var , 21, and a: 74.5%. No, because she consistentl scores above 80%. b: 84.25% c: It lowered her mean a lot. Yes = 642 centimeters b d c a e Lesson (Da 1) a: See sample graph at right. b: Yes, students with larger shoe sizes tend to be taller a: median = 8, minimum = 6, maimum = 10 b: first quartile = 7.5, third quartile = 8.5 c: Height (cm) Shoe Size d: Answers will var a: ( ) 2 = 80.5 b: 83.67% a. b. c. d a: 8 b: 29 c: 48 d: 22 e: 80 f: 12 g: 0 h: 3 i: 5 j: 30 k: 0 l: 10 Selected Answers 2013 CPM Educational Program. All rights reserved. 3

4 16 Lesson (Da 2) a: 7.5 in. b: 12 m c: 16.5 cm a: 9 14 b: 30 c: d: ( ) 4 = 84% a: See plot at right. b: mean = , median = 27 c: The mean would be lower and the median would remain unchanged MT 45 sq. units, CA 51 sq. units a: A 5-unit square with a 4-unit square inside it. b: 9 un 2 Lesson a: Not proportional because the graph does not go through origin. b: Not proportional because graph is not linear and does not go through origin. c: Proportional a: 1.15 b: 24 5 c: 0.24 d: e: f: g: or h: a: Stead increase in speed. i: 0.87 b: Quick increase in speed then levels off at certain speed. c: Increasing acceleration, speed increases more and more quickl a: See graph at right. b: It is growing faster as the das go b. Height (cm) Time (das) CPM Educational Program. All rights reserved. Core Connections, Course 3

5 Lesson a: 20 b: c: hours Number of Letters: 15, 42 Cost of Stamps: \$3.15, \$0.45, \$ Number of Students Hours of Sleep Todd is 37 ears old, while Jamal is 27 ears old a: d: 4 3 = b: 4.1 c: = 7 5 = e: = f: 2.24 Lesson a: P = 120 units, A = 647 sq. units b: P = 70 units, A = 192 sq. units 2-9. a: 11 b: 14 c: 30 d: Let represent the shorter piece, = 84, = 33. The pieces are 33 meters and 51 meters long. Selected Answers 2013 CPM Educational Program. All rights reserved. 5

6 Lesson a: b: It is not possible to simplif this epression, since none of the terms are c: d: 4m 2 + 5m + 2mn a: 7 b: 14 c: 2 d: a: 200 blue candies b: \$1495. \$14,950. \$ a: A( 4, 3), B(2, 1), C( 2, 0), and D( 3, 3) b: 4 2 E F 2 4 G H Lesson a: b: c: d: b: 4 c: Let b represent the number of beige tiles, b + (b + 25) + 3b = 435, b = 82. She is buing 82 beige, 107 red, and 246 nav-blue tiles a: 45 b: 10 c: 2 d: 264 e: 1 4 f: a: 35 g. 70 g b: 3.5 grams per cookie c: Cookies: 200, 400 Sugar:35, 70, 7, 3.5, CPM Educational Program. All rights reserved. Core Connections, Course 3

7 Lesson a: Possible b: Possible c: Not Possible a: 2 3 ( +1) = 4 b: = 2 c: ( + 2) = a: 14 b: 6.5 c: 74 d: 12 e: a: b: c: d: Perimeter = 52 units, area = 168 sq. units Lesson a: b: c: d: Yes, Francine is correct. Commutative Propert of Addition a: The steeper line is B. b: 3 ears c: \$65,000 d: Compan B. Its line is steeper a: 23.8 b: 36 c: 1.5 d: eggs Selected Answers 2013 CPM Educational Program. All rights reserved. 7

8 Lesson a: The right side is greater. b: The are equal a: A = 2, B = 4, C = 3, D = 1. 5 is not matched. b: Base = 6 units, height = 4 units, area = 24 square units c: The area of the rectangle represented b the point (6, 4) is 24 sq. units, not 36 sq. units. d: Answers will var. e: A curve a: 31 b: c: 10 d: a: \$ = \$4.19 b: \$ gallons = \$ c: 1.2 gallons. \$5.03 \$4.19 = a: Car A, because its line is steeper. b: A(2, 120), B(4, 120) c: d: Yes, because the distance = constant time. Lesson Not quite. She correctl removed 2 from both sides, flipped a 1 from the region to the + region, and removed a zero; however, on the left side, the 1 and the 1 in the region do not make zero, so this is not a legal move a: Associative Prop. of Addition b: Commutative Prop. of Addition c: Associative Prop. of Addition a: Figure 4 is a 5 b 5 square, and Figure 5 is a 6 b 6 square. b: An 11 b 11 square A 101 b 101 square. c: Figure 5 would have 21 tiles. Figure 8 would have 33 tiles. Each figure has 4 more tiles than the figure before it a: ; 4(10) + 2(6) + 2 = 54 units b: = (10) 2 + 2(6) +1 = 113 square units a: 4 b: 1 c: 7 d: 2 e: 5 f: 6 g: CPM Educational Program. All rights reserved. Core Connections, Course 3

9 Lesson (4 ) = 2 3 ( 2) a: Not true, because b: True (Identit Prop. of Mult.) c: True (Inverse Prop. of Mult.) d: True (Inverse Prop. of Mult.) a: b: c: 0 d: Answers will var a: 60 b: 32 c: 3598 d: 6 Lesson Let represent the number of weeks she saves, = 87, = 16, It will take her 16 weeks to save the mone a: True (Commutative Prop. of Mult.) b: True (Identit Prop. of Add.) c: False d: True (Identit Prop. of Mult.) a: b: c: d: The 24-ounce bag is best. It costs approimatel 5 per ounce, while the 36-ounce bag costs about 8 per ounce a: 8 b: 1 c: 2 d: 17 e: 45 f: 125 Selected Answers 2013 CPM Educational Program. All rights reserved. 9

10 Lesson a: Rule- Triple and add 2; IN: 7, 100, OUT: 2, 6.5 b: Rule: Multipl b 2.5; IN: 3, 11; OUT: 22.5, 0 c: Rule: Divide b 2 and add 1; IN: 6, 7; OUT: 1.5, a: It subtracts 6 from the input value. b: = 385, \$50, \$250, and \$ ( + 3) = 6 (1 1). = a: Car B. Its line is steeper. b: In 2 hours, both cars were 80 miles awa from the game. c: 160 miles Lesson a: Multipl b 2 and add 1. b: = a: + 4 = 3 2 ; = 3 b: + 2 = 1; = a: 31 b: a: 13 b: 4 c: 36 d: 4 e: 16 f: CPM Educational Program. All rights reserved. Core Connections, Course 3

11 Lesson a: = 5 b: = 10 c: = 15 d: = 2 e: = 10 f: = 3 or a: c = 2 b: No solution ( + 3) = 6 ( 1+1). = students a: 26 b: 4 c: 2 d: a: Multipl b 3. b: = a: = 4 b: p = a: 2 +1 ( 2) = 2 ( 2), = 1 b: 0 = \$ games. \$ a: , , b: c: = Lesson Answers will var a: = 2 b: = a: 37 b: 5.5 c: 3 d: a: 71.4 or 72 tomatoes b: 81 people Schnauzers Selected Answers 2013 CPM Educational Program. All rights reserved. 11

12 Lesson = a: b: a: left = 4, right = 7 (left is greater) b: left = 5, right = 1 (right is greater) a: 8 15 or 0.53 b: a: = 2 b: = 3.5 c: d: or Lesson Sample table and graph: Figure 0 will have 1 square, Figure 4 will have a 5-b-5 square with 8 tiles attached in a row on the right, and Figure 100 will have a 101-b-101 square with 200 tiles attached in a row on the right , 2(7) + 4(3) + 2 = 28 units a: b: c: d: CPM Educational Program. All rights reserved. Core Connections, Course 3

13 Lesson a: b: ( 3, 2) c: A parabola d: ( 3, 2) should be ( 3, 5) a: b: c: The parabola in part (a) points upward, while the parabola in part (b) points downward. d: ± 2.6 e: ± a: \$30 b: She earns \$6 per hour, so after hours, she earns 6 dollars. c: See graph at right. It should be continuous assuming that she is paid for partial hours Left Epression: 2 + 4, ; Right Epression: 3+1, 0; Eplanation: Flip the tiles from region to + region, Take 4 awa from both sides a: b: c: d: Selected Answers 2013 CPM Educational Program. All rights reserved. 13

14 Lesson a: = 2 b: = 1 c: ( 3) represents the opposite of 3, which is a: Yes b: No c: No d: Yes IN () OUT () a: See graph at right. b: It is a slanted line that decreases as increases a: b: c: d: a: \$68.75 b: 20 pounds -intercept: (0, 1) -intercept: (0.5, 0) (2, 3) Lesson a: = Figure 0 Figure 4 b: (5, 12) a: b: = 2 1 IN () OUT () Area 176.7, circumference a: An number b: m = 9 c: = 4 d: p = a: # of Books 12, 73 b: Minutes 0, 14 c: Miles 420, 350 Das 15, 1 Blocks 2.5, 50, 75 Gallons 1, 5, CPM Educational Program. All rights reserved. Core Connections, Course 3

15 Lesson a: No solution b: = 3.5 c: An number d: = a: 42 b: 3 c: 12 d: Let represent the width of the rectangle, 2 + 2(2 + 3) = 78, 27 cm and 12 cm IN () OUT () a: See graph at right. b: A parabola opening upward a: 20 7 = b: c: d: = 48 5 = Lesson a: b: c: d: The are downloading at the same rate, 0.8 songs/min a: = 2 b: = 1 c: All numbers d: = IN 4; OUT 8, 3, 1, 24 a: Answers will var. Sample response: The product of and is alwas 24. b: = 24 or = 24 c: See graph at right a: Three less than five times b: Twice the sum of and c: Three decreased b the sum of and 5 Selected Answers 2013 CPM Educational Program. All rights reserved. 15

16 Lesson a: = 2 b: = a: b: c: d: median = 61, upper quartile = 97, lower quartile = A sq m, P m a: \$0.84 pound b: 0.6 g cm c: \$3.50 d: \$11.88 e: 169 shots f: teaspoons CPM Educational Program. All rights reserved. Core Connections, Course 3

17 Lesson (Da 1) 4-2. a: b: Figure 0 Figure 4 Figure 5 Figure 0 Figure 4 Figure 5 c: d: Figure 0 Figure 4 Figure 5 e: Figure 0 Figure 4 Figure 5 Figure 0 Figure 4 Figure a: b: c: The point would lie at (5, 19), because the rule is = or because it is possible to predict on the graph a: 45 b: 6 c: 62 d: a: b: c: d: a: 6 21 b: c: 5( + 2) d: 4(2 + 3) Selected Answers 2013 CPM Educational Program. All rights reserved. 17

18 Lesson (Da 2) 4-7. a: The parabola should pass through the points (0, 0) and (2, 0) and have a verte at (1, 1) She should have received two sports cars and ten pieces of furniture ( 2) = 3 ( + 2) a: = a: b: c: 0 d: = 2 +1 Lesson a: 3 b: words IN 5; OUT 19, 1, 15, 2005, 2+5 a: Multipl b 2 and add 5. b: = Each sister received 1 poster, 72 books, and 8 CDs a: 25π 78.5 sq. ft. b: \$ CPM Educational Program. All rights reserved. Core Connections, Course 3

19 Lesson a: b: Figure 0 Figure 4 c: = cm Figure # # of Tiles a: = 2 b: = IN () OUT () = 25 (unit rate), = 120 gallons Lesson a: Answers will var. b: Each figure has 4 more tiles than the figure before it. c: = Figure 0 has 7 tiles. Figure 1 has 9 tiles. The pattern of growth is adding 2. The rule is = a: All numbers. b: = If is m number, then 5 2 = 1; = IN: 5, 5, 4, 1.5, 50; OUT: 11 a: Multipl b 3 and subtract 2. b: Answers will var. Selected Answers 2013 CPM Educational Program. All rights reserved. 19

20 Lesson Possible solution table: a: See graph at right. b: Yes. 152 = 3( 50) Answers will var A = 72.25π mm 2, C = 17π 53.4 mm (0, 2) a: b: c: d: a: 5 1 b: 11 1 c: 5 1 d: Answers will var a: The line should pass through (3, 0) and (0, 3). b: Yes. 29 = a: An number. b: = 0 c: r = 6 d: No solution a: = 6 b: = 16 c: = 1.5 d: = a: This should be a horizontal line with a positive -value that ends at = 10. b: This should start with positive -value and have a slope of 0, then it should turn to negative slope, and then it should return to a slope of 0 at the -ais. c: This should start horizontall along the line = 0, then it should rise quickl to a higher horizontal line, and then it should descend to a lower positive horizontal line, ending at = CPM Educational Program. All rights reserved. Core Connections, Course 3

21 Lesson a: b: c: d: a: A and C have 0 tiles, and B has 30 tiles. b: C grows most quickl at 10 tiles per figure. Its line is the steepest. c: Figure 2. The lines intersect at (2, 20). d: = The first can be stated, is twice increased b 5, and the second can be stated, is 6 times increased b 5. a: Both have 5 tiles. b: = m is greater a: A = 72 sq cm, P = 48 cm b: A = 37.7 sq. in., P = in teaspoons, which is 3 tablespoons and 3 4 teaspoon. Lesson a: : (1.5, 0), : (0, 3) b: and : (0, 0) c: No -intercept, : (0, 3) d: : (6, 0), : (0, 3) a: : 250; : 65, 405, b: : 56, 296, 596, c: : 23; : 8, 299, Figure = Josie is correct, 10 inches long a: A 28.27cm 2, C 18.85cm b: A ft 2, C ft c: A ft 2, P ft d: A ft 2, P ft Selected Answers 2013 CPM Educational Program. All rights reserved. 21

22 a Lesson = a: = 5 b: = 2 3 c: No solution d: = a: 11.2 b: 7.5 c:3.75 d: See graph at right. (2, 5) 5-9. Answers will var. Lesson a: = 10.5 b: = Answers will var A + A + (A 15, 000) = 99, 000, 54,000 votes a: m = 3 b: (0, 2) c: = a: = 5 b: = 2 c: = 0 d: = CPM Educational Program. All rights reserved. Core Connections, Course 3

23 Lesson or 2.57 blocks per minute = minutes a: Leslie passes Gale b: 2:00 p.m. c: 18 miles d: Answers will var. e: At approimatel 6:40 p.m See graph at right. a: = 3 1 b: = a: The opposite of increased b 8. b: 48 less than two times. c: The square of the sum of and 3. d: 6 2 e: a: = +5 2 b: w = p 9 3 c: m = 2n + 5 d: = 3 Lesson a: Science Club: = , Math Club: = b: In 6 weeks. c: \$ a: b: int: (0, 1), -int: ( 1 2, 0) dumplings, 12 egg rolls, 4 sweet buns, and 4 drinks a: = 10 7 b: = 27 5 Selected Answers 2013 CPM Educational Program. All rights reserved. 23

24 Lesson She is not correct, because the point does not make both equations true See graph at right. a: (2, 1) b: (2, 1) c: Answers will var a: = 20 b: a = a: The do not intersect, the are parallel. b: No solution. c: Parallel lines do not intersect times at bat Lesson a: (5, 3) b: (2, 6) a: = 4 3 b: = + 3 c: = d: = ounces a: = 8 3 b: = a: = 2 b: = 3 2 = c: Answers will var. c: = 3 d: No solution CPM Educational Program. All rights reserved. Core Connections, Course 3

25 Lesson Reflect (flip) across the -ais, slide 7 spaces right or slide 7 spaces right, reflect across the -ais a: = 2 +1 b: -intercept = (0.5, 0), -intercept = (0, 1) c: d: = B. Answers will var Rena is correct because 9(( 5) + 4) = 9 and 1+ 2( 5) = = a: After 4 hours b: 10 Lesson See graph at right. Triangle D is an answer for problem See graph in problem (5, 4), (7, 6), and (6, 7) C A D ( 2, 1) B Yes, on average, she will make about 450 baskets a: b: = 5 +1, 51 tiles Figure 0 Figure a: In 9.6 weeks, the will both weigh pounds. b: Answers will var. Selected Answers 2013 CPM Educational Program. All rights reserved. 25

26 Lesson a: No, her shape translated 10 units to the right, and 6 ( 4) = 10. b: 8 5 ; It moved 10 units right and 3 units up. c: i: right 2, down 7; ii: right 7, down 6; iii: left 4, down 7; iv: right 4, up a: ( 2, 3), ( 2, 3), and ( 3, 1) b: See graph. ( 1,1), ( 5,1), and ( 6, 3) c: Yes, because translations and reflections do not change the shape or size of a shape a: = 4 3 b: = + 3 c: = d: = Let s represent the length of Side #1, s + s + 2s 1 = 31, Side #1 = Side #2 = 8 cm, Side #3 = = 15 cm B A T a: or b: 0.12 c: d: = , Figure 0 = 3 b: 2, Figure 0 = 3 c: 3, Figure 0 = 14 d: 5, Figure 0 = 3 Lesson a: Slide the triangle to the right 2 units and down 3 units. b: ( 1, 0), ( 1, 2), and ( 0, 0) c: ( 3,1), ( 3, 3),( 2, 3) See table and graph at right a = 3, b = No. When = 12, = 128, so it would have 128 tiles = 2.5, = 30 minutes a: = b: Yes. It can be written in the form = m + b. c: growth = 2, -intercept = (0, 2 3 ) CPM Educational Program. All rights reserved. Core Connections, Course 3

27 Lesson a: ( 6, 4 ), ( 2, 4 ), and ( 4, 4 ) b: ( 1, 3) c: Its sides are twice as long and it is rotated ( 2) 2 3 ( 2) +1 = She combined terms from opposite sides of the equation. Instead, line 4 should read 2 = 14, so = 7 is the solution This statement is false because the Distributive Propert states that a ( b + c) = ab + ac IN-- 4; OUT-- 19, 11, 32, 298, 3 2 Lesson ( ), ( 1,12), ( 4, 8) , 8 The shapes are not similar because corresponding angles are no longer equal a: \$18 b: She sold 19 brownies a: = b: Figure a: \$15.25 b: \$ hours = \$ Mr, Greer distributed incorrectl. The correct solution is = a: Median = 80%. Highest = 100%, lowest = 55% b: It cannot be determined from a bo plot. c: 16; 8 d: It cannot be determined from a bo plot. Selected Answers 2013 CPM Educational Program. All rights reserved. 27

28 Lesson Figures A and F, B and D, and G and I are similar \$ = a: None, b: One (t = 3) c: One (m = 0) d: Infinite, = a: b: 12 5 c: d: or Reflection b: Rotation c: Rotation d: Reflection Lesson a: Slide the triangle to the left 2 units and up two units. b: ( 3, 3), ( 2, 2), ( 3, 1) c: (1, 1), (0, 0), (1, 1) a: Yes b: Yes c: The lines coincide = a: = 2.2 b: = 6 c: = 10.5 d: = a: 25% b: 50% c: No, because the individual data points are not given a: = b: = CPM Educational Program. All rights reserved. Core Connections, Course 3

29 Lesson , = 24mm, = 10mm a: Dividing b 1 3 will undo multipling b 1 3 ; since multipling b 1 3 smaller, dividing must make the shape bigger. b: 30 3 = 10 and = 10 makes the shape a: See graph at right. b: No solution. c: There is no solution to the sstem of equations because the two lines do not intersect a: 47 inches b: 43nches and 49 inches c: ( 3,12), ( 2,10), 0, 6 ( ), ( 2, 2), ( 4, 2), 6, 6 a: Multipl b negative 2 and then add 6. b: Answers will var. ( ) c: The letter C. (b) (a) Selected Answers 2013 CPM Educational Program. All rights reserved. 29

30 Lesson a: 6 2 = 12 b: = a: 36 m, 12 m b: 54 sq m, 6 sq m c: Perimeter is also 1 3 as long Part (a) is done correctl since it has both the equall spaced number line and the bo plot. Part (b) has an equall spaced number line that is numbered incorrectl a: Parallelogram B A C D b: A ( 3, 1), B ( 1, 3), C ( 4, 2), and D stas at 2, 0 c: ( 9, 3), ( 3, 9), ( 12, 6), ( 6, 0) ( ) = 8 18, = 32 9 = a: The are congruent. b: The are similar a: = b: Figure # # of Tiles # of Tiles Figure # c: = 3 +1 d: = CPM Educational Program. All rights reserved. Core Connections, Course 3

31 Lesson a: 23% b: Coal and renewable totals 30%; natural gas and nuclear also total 30%; students might see either combination or both. c: Oil and nuclear total 48% See graph at right. Bus 37.5% Ride in Car 31.25% 7-9. a: = 8 6 b: = c: = 3 Ride Bike 12.5% a: No solution. b: Infinite solutions because the lines coincide. Walk 18.75% a: A trapezoid b: The are right angles. c: ( 6, 2), ( 0, 5), ( 0,11), ( 6,11) Lesson a: Answers will var. b: See graph. Answers will var a: ii: As latitude increases, temperature drops (or as temperature increases, latitude drops). b: iv: All cars, regardless of weight, go about the same speed. c: iii: No relationship. d: i: People with more epensive homes tend to have more epensive cars a: 3 b: 1 c: 2 Price (Thousand \$) Horsepower a: (10)(17) = = 170 square units b: 54 units a: 16 b: 2 c: Undefined d: a: 18% b: No. The data is not numerical; she could have made a bar graph. c: 2925 fiction books Selected Answers 2013 CPM Educational Program. All rights reserved. 31

32 Lesson a: Negative association: as the number of hours watching TV increases, GPA decreases. b: Positive association: as age increases the number of gra hairs increase. c: No association between length of hair and shoe size a: See sample graph at left. Height of plant (cm) Depth of seed in pot (cm) a: Median = 731, IQR = = 277 b: Answers will var. c: Answers will var. b: Answers around 7 or 8 cm are reasonable. c: About 30 or 31 cm. If the seed is left on the surface of the dirt (0 cm deep), it is predicted that the plant will grow to about 31 cm a: = 8 15 b: a: = 3 b: = 7 10 c: d: or In an order: translation, rotation, dilation CPM Educational Program. All rights reserved. Core Connections, Course 3

33 Lesson This would be an eample of a negative association, because as the speed increases, the time it takes to drive a constant distance decreases Let represent the price of first painting, , = 2000, The most epensive painting sold for \$10, a: Range is 68. Both 39 and 107 appear to be outliers. b: Median = 70, upper quartile = 79.5, lower quartile = a: or 3 5 b: = 9 meters, = 30 meters a: = and = 172 4, represents weeks, represents total mone a: b: The will have the same amount between weeks 15 and 16. d: or or b: 5 24 c: 3 6 or 1 2 e: f: Lesson a: Line A because it increases most quickl. b: 5 c: The are equal A, D, C B A line that is flat or does not go up a: 30 % b: Water park (30%) and Amusement Park (29%) c: Answers will var Let s = # students, a = # adults, s = 3a 150, s + a = 1778, 1296 students = 15, = 9 Selected Answers 2013 CPM Educational Program. All rights reserved. 33

34 Lesson slope = a: 3 5 b: 6 5 c: 2 2 = a: = 5.5 b: = 42 c: = 24 d: = = 4.5, = 1.5. represents the number of hours she swims. She will swim for 1.5 hours and pla volleball for 3 hours a: line a: = 2 2, line b: = b: It would lie between lines a and b, because its -intercept is at (0, 1). c: It would travel downward but would have the same -intercept as the line from part (b) a: = 5 b: = 2 c: = 0 d: = 38 Lesson a: > b: = c: < Graph 1: positive, non-linear association, with one outlier, Graph 2: positive linear association with no outliers The slope of 4 3 is correct because the line is decreasing and for ever four units that the line moves to the right, it also goes down 3 units a: = 12 b: w = 0 c: = 1 d: No solution a: 0 pounds b: The graph should show a line with positive slope. Units labeled on the aes should be in pounds (vertical ais) and feet (horizontal ais). c: 4 3 pounds d: 9 feet a: 4896 sq. units b: sq. units c: 900 sq. units d: 336 sq. units CPM Educational Program. All rights reserved. Core Connections, Course 3

35 Lesson a: 6.75 miles b: = Neither, 10 8 = A( 2, 3), B( 1, 7), C(3, 6), D(2, 3) a: b: c: d: a: 4 3 b: ( 0, 5 ) c: = a: Let w represent the width of the lawn, 2w + 2(2w + 5) = 250. b: w = 40, the width of the lawn is 40 feet, and the length of the lawn is 85 feet. c: The area of the lawn is 3,400 square feet. Lesson Answers will var See graph at right. : (12, 0) and : (0, 6) See graph at far right earbooks a: P = 40.3 ds., A = 77 sq. ds. b: P = 60 ft., A = 150 sq. ft See graph at right. a: The do not intersect, because the are parallel. b: No solution. c: No solution. Parallel lines do not intersect. Selected Answers 2013 CPM Educational Program. All rights reserved. 35

36 Lesson a: Moderate positive linear association with no outliers. b: If the -intercept was drawn at the origin or negative, it does not make sense; a child of zero ears should have a little positive height a: A bo plot shows center and spread of single-variable numerical data nicel. b: A scatterplot will show the relationship between age and mpg. c: See graph at right. d: Weak negative linear association. e: = f: About 31 mpg. g: A slope of negative 0.7 means that for each additional ear old a car is, we epect it to go 0.7 less miles per gallon; -intercept of 36 means that a new car is predicted to go 36 mpg hops a: Liz is saving at a greater rate because her line is increasing faster (is steeper). Average Miles per Gallon Age of Car (ears) b: Liz: 60 2 or 30 1, Jeffre: The slope tells ou at what rate the each are saving a: = 2 b: = 15 c: = 2 d: No solution CPM Educational Program. All rights reserved. Core Connections, Course 3

37 Lesson a: Number of Highl Fuel Efficient Trucks Purchased: 834 Regular Trucks Purchased: Low Fuel Prices: High Fuel Prices: Fuel prices Number of Highl Fuel Efficient Trucks Purchased Number of Ordinar Cars and Regular Trucks Purchased b: There does not appear to be an association; onl about 1% of cars are fuel efficient, regardless of whether prices are high or low. Number of Highl Fuel Efficient Trucks Purchased Number of Ordinar Cars and Regular Trucks Purchased See table below; the independent variable is the hours of sleep; there is an association; as the number of hours of sleep increases, a higher percent of the students remember all ten items. Remembered all 10 items? Yes No Less than 7 hours sleep 3.9% 96.1% 7-9 hours sleep 9.2% 90.8% At least 10 hours sleep 20.0% 80.0% a: Moderate negative association. b: (100, 140) Yes, 1500 wph = 25 words per minute; he can tet 125 words in 5 minutes a: ( 11, 18) b: (16, 21) a: = 15 4 = b: = \$ \$1.74 c: = 5 d: = 12, = 16 Low Fuel Prices High Fuel Prices ,929 42,255 Low Fuel Prices High Fuel Prices 1.1% 1.0% 98.9% 99.0% Selected Answers 2013 CPM Educational Program. All rights reserved. 37

38 Lesson a: P = \$500, I = \$37.50, r = 2.5% (0.025), t = 3 ears b: I = 200(0.04)(5) = \$ If she takes the loan, she will need to pa back \$372; she saves \$22 b waiting % a: 4 ( + 2) b: 5 ( 9 + ) c: 7 ( 3) a: # OF STUDENTS Hours Spent Studing Per Week Hours of After- School Activities Per Week Less Than 8 Hours Eight or More Hours Less Than 5 Hours = 60% 40% Five or More Hours = 32% 72% b: There is an association, but it is opposite what we might epect = mm, = 81 mm, z = 22.5 mm CPM Educational Program. All rights reserved. Core Connections, Course 3

39 Lesson Rachel will have \$1480, so she will still be \$20 short a: 7 zeros. 23 zeros b: Answers will var a: Answers will var. b: \$ c: \$ Number of Students on the Trip Bus Cost per Student (\$) 10 \$35 15 \$ \$17.50 Bus Cost per Student (dollars) 35 \$10 Students on Trip a: No, it can never pass through (0, 0). b: Yes, there is an association because for ever etra student who goes on the trip, the cost decreases for all the students. Non-linear negative association; the association is ver strong; there is no scatter at all in this relationship a: b: c: d: 4 3 or See graph at right. New vertices: 0, 2 All pairs of corresponding sides are parallel. ( ), ( 6, 4 ), and ( 4, 8). Selected Answers 2013 CPM Educational Program. All rights reserved. 39

40 Lesson a: 1 represents 100%, or the full amount in the account, and r represents the interest rate. The are added so that ou calculate the percent based on the previous balance, not just the principal. b: \$ a: 16 b: 729 c: d: 16 e: 729 f: g: Answers will var Eponent Form: 4 3, 5 3, 8 3 Factored Form: 3 3 3; ; ; ; Standard Form: 27; 48; 216; 343; 512; Let represent Carrie s number, + ( + 9) + ( + 6) = 207, = 64, + 6 = 70, Fran s number is See graph at right. (2, 5), (2, 1), (5, 0) \$ , non-linear growth A C B CPM Educational Program. All rights reserved. Core Connections, Course 3

41 Lesson a: b: c: = (6) Products: ; 6,893,000; 58,600; See graph at right. (4,4), (7, 4), (6, 7) Yes, there is a strong association. If the kelp rate is low, there are a greater percentage of small crabs. If the kelp rate is high, larger crabs grow \$ is greater because the power of 10 is larger a: b: a: 7776 b: 8 27 c: 625 d: a: Both strategies will work eventuall, but adding five to both sides will isolate the term. b: = a: = 3 2 b: Answers will var This parabola should point downward and pass through (0, 0) and ( 2, 0); the verte is at ( 1, 2). The graph is non-linear. Selected Answers 2013 CPM Educational Program. All rights reserved. 41

42 Lesson a: 3 b: = 81 4 c: 3 8 ( 1 3 )2 = 729 d: a: Negative b: 6 hours a: Solution is incorrect. b: Solution is correct See graph at right. a: (1, 2), (4,1), (1, 2) b: ( 4, 2), (2, 4), ( 4, 6) c: (2, 1), ( 1, 2), (2, 3) a: = b: = a: > b: > c: = d: < e: < f: < CPM Educational Program. All rights reserved. Core Connections, Course 3

43 Lesson (Da 1) a: b: Correct c: Correct d: Power Decimal Fraction a: The 1 moves one decimal place to the of 10 Form Form right, and the denominator of the fraction is multiplied b a: \$ b: Yes, \$ b: Write 1 in the numerator and 1 followed b 12 zeros in the denominator. c: The graph would be a curve that begins at \$6439 and curves upwards a: 6 b: 17 c: 4.5 d: 3 e: 13 f: a: = 2 b: = 5.75 c: = 5.2 d: = a: ( 2, 7) b: 1 ( 2, 4 ) Selected Answers 2013 CPM Educational Program. All rights reserved. 43

45 Lesson a: 8 b: 1 c: 2 d: a: b: c: a: = 7 b: = c: = 2 d: = See table at right. a: = b: 2 3 c: Linear growth, it has a constant growth rate or slope a: 20 8 = 2.5 b: s = 14, t = 40 c: Answers will var Answers will var a: 100 b: 43 c: 47 d: d = 148 ; f = 32 e: Let b = bank balance, m = # months, b = 3m + 210, b = 4.5m The girls will have the same amount of mone in months a: Prices: \$0.40; \$1; \$2.40; \$3 b: See graph at right. c: Yes, because the data makes a straight line through (0, 0). d: The slope is 2 10 or 0.2. The slope is the same as the price per ounce (\$0.20 per ounce). e: = 0.2 Price (\$) Amount of Taff (oz) a: = 9 b: = 14 3 c: = 13 5 or 2.6 d: = a: b: c: a: ( 2, 2), ( 2, 0), (1, 2) b: (4, 1), (4, 3), (1, 1) c: ( 1, 4), ( 3, 4), ( 1, 1) d: ( 8, 2), ( 8, 6), ( 2, 2) Selected Answers 2013 CPM Educational Program. All rights reserved. 45

46 Lesson a: m 2 = 63º, lines, alt. int. s =, m 3 = 117, suppl. s. b: 3 18º = 74º, = 30.67º, lines, corr. s =. c: 3 9º = + 25º, lines, alt. int. s =, = 17º; m 2 = 3(17º) 9º = 42º, substitution Answers will var. m 1 = 53º, m 2 = 72º, m 3 = 55º, m 4 = 127º, m 6 = 55º a: Yes, positive b: Yes c: No d: The short people ma be oung and have not et learned to spell ver well = 61.5, = 82 miles Test Score (%) p.m a: Yes b: No c: No d: Yes e: No f: Yes Height (inches) Lesson a: 55, right b: 60, acute a: m 4 = m 5 (alt. int. s =) or m 4 = m 8 (corr. s =), then st., m 6 = 119 or m 4 + m 6 = 180 degrees (same side interior s suppl.). b: corr. and vert. s or vert. s, alt. int. s, vert. s, m 8 = 48 c: corr. s =, suppl., m 8 = See graph at right See graph at right. The data shows a negative association a: 270 sq. ft. b: 30 sq. ds a: = b: = Avg. Miles per Gallon Age of Car (ears) CPM Educational Program. All rights reserved. Core Connections, Course 3

47 Lesson a: c is parallel to d, alt int. s = b: e is parallel to f, corr. s = c: None d: c is parallel to d, vert s =, then corr. s = e: c is parallel to d, suppl. same side int. s = a: = 22.5, st. b: d = 49, st s, e = 41, 180 or et. c: f = 43, et a: 20 7 = b: c: d: = 48 5 = a: = 7 b: = 2 c: = 2 d: = a: \$50.40 b: \$ a: See table and graph below. Week Mone b: See where the -value for = 18 is on the graph; in table between 10 and 11 weeks. c: The entries in the table grow b a constant amount (\$150 each week) and the graph of the values makes a straight line. Selected Answers 2013 CPM Educational Program. All rights reserved. 47

48 Lesson a: 15 3 b: 7.7 c: = Sample graphs: a: b: Median = 61, first quartile = 48, third quartile = a: ( 2, 3) b: ( 2, 3) c: Yes a: = 60, acute b: = 24, obtuse a: Bo plot b: Scatterplot c: See graph. d: Strong negative association. e: See graph. f: \$17,000 g: Slope of 3 means the car is losing \$3000 in value each ear, -intercept of 35 means the cost when new was \$35,000. Listed Cost (in 1000s) Age of Car (ears) CPM Educational Program. All rights reserved. Core Connections, Course 3

49 Lesson a: Yes, there are two equal angles, the right angle and the 30 angle. b: 6 cm c: 8 3 d: Small = 27 sq. cm, large = 192 sq. cm Yes, an obtuse triangle will be formed because 36 > : 1; 0 : 14 a: = 3 2 b: = shortest side length, (10 + 2) = 142. Sides are 22 cm, 54 cm, and 66 cm Cisco is incorrect. She also needs to be sure that the graph makes a straight line or that the table would have equivalent ratios; the graph of = 2 does not make a straight line a: = 11.5 b: = 6 c: = Obtuse. 6, 20, and 25 units a: Intersect, slopes are different b: Parallel, slopes are equal c: Parallel, slopes are equal d: Coincide, equations are equivalent a: Linear growth, the graph is a line with constant slope. b: The graph shows the distance from home at different times. Answers will var. c: 9 miles d: The person is traveling 2.5 miles per hour awa from home. e: = He did not match up corresponding sides Carbon weighs more. An eponent of 22 indicates that the decimals was moved 22 places to the left (versus 27 for hdrogen) a: \$ b: No; \$ Selected Answers 2013 CPM Educational Program. All rights reserved. 49

50 Lesson rectangles (1 b 24, 2 b 12, 3 b 8, and 4 b 6). No , 15, and 17 because = = = 9 rides a: 2 3 b: 2 c: (0, 3) a: = 30 b: = 22 c: = a: b: = = 136 = = CPM Educational Program. All rights reserved. Core Connections, Course 3

51 Lesson a: 15 cm b: 121 cm c: 20 m d: ft a: 6 b: 8.1 c: 9.2 d: a: 2 b: (0, 5) a: b: c: d: Table b is not a function because there are two different outputs for when = He is correct, because 2(2) + 4 = 0 and 2 2 = a: 17.5 feet b: 175 sq. ft. c: = w 50, w = a: = 8, right angle is 90 b: = 20, straight angle is 180 c: = 20, sum of angles in a triangle is 180 d: = 60, same reason as (c) SA = 34 square units, V = 10 cubic units a: 64π = cm 2 b: 900π = cm a: b: c: Selected Answers 2013 CPM Educational Program. All rights reserved. 51

52 Lesson a: units. I b: units. I c: 5 units. R cup P = 34 m, A = 74 sq m a: b: a: b: 18a 6 b 4 c: 9m 3 n 2 d: 1 e: m4 n 2 f: 3a4 b a: 0 b: 32 c: a: rational, 6 1 b: rational, c: irrational a: ( 1, 1) b: (36, 16) a: (0, 6) b: See table and graph at right miles ( ) ( ) = 36, 700 ; 4700 attended on Thursda, 10,200 on Frida, 9400 on Saturda, and 12,400 on Sunda CPM Educational Program. All rights reserved. Core Connections, Course 3

53 Lesson a: Side lengths of 3, 4, and 5, perimeter of km b: Right triangle. The legs are perpendicular because the align with the -coordinate grid a: 7 10 b: 7 9 c: = 3 20 d: = a: 28 5 = b: 100 c: 10 d: e: 7 12 f: g; h: a: b: 2 3 c: 1 4 or a: non-linear b: linear c: non-linear Lesson meters mm a: = 4.5 b: = 6.4 c: = a: = 3 5 b: 2 10 = c: 1 4 d: a: = + 2 b: ft Selected Answers 2013 CPM Educational Program. All rights reserved. 53

54 Lesson a: The tree is a little over 8 feet tall. b: The tree will not hit the fence a: Vertical angles. Congruent = 5 57, = 31 b: Straight angle pair. Supplementar = 180, = The lines are parallel, so the do not intersect; therefore, there is no solution a: 24 b: 7 24 or approimatel 29% c: a: or 24 7 b: 27 4 or c: 18 5 or Lesson a: 12, rational b: 3.78, irrational c: 0.5, rational a: 5 inches b: 150 sq. inches Triangle = = 38 m 2, rectangle = (21.25)(7.6) = m 2, total area = m 2, hpotenuse of triangle is m, so perimeter = m a: = b: = 8 11 c: = 7 40 d: Possible equation: 6 p + 28 = 80, where p = packs of plants, p = 8 2 3, so 9 packs are needed a: = b: = 14 c: = 114 d: = = CPM Educational Program. All rights reserved. Core Connections, Course 3

55 Lesson a: A = 25π = cm 2, V = cm 3 b: A = π = cm 2, V = cm in. 3 ; No, the shape of the base does not matter, just its area a: 12, rational b: , irrational c: 8, rational a: = 5 6 b: a 3 b c: 83 = 83 1 d: a: 6 b: 8 c: 24 d: 24 e: 0 f: a: \$3000 b: \$ c: The simple interest account. Lesson V = 36π 8 3 = 96π = in cubic feet. Volume of the prism = 3 times the volume of the clinder Table (b) is proportional because it is the onl one that could contain (0, 0) and grows using a Giant One mm a: 16 units b: ( 1, 6), ( 5, 3), and ( 1, 0) c: It is still 16 units a: See table far right, the rule is undefined for = 1. b: See graph at right. c: Non-linear growth, the values do not increase b a constant amount. d: Yes, there is onl one output for each input Selected Answers 2013 CPM Educational Program. All rights reserved. 55

56 Lesson a: π cm3 b: 4.5π feet π r3 = , r = 3 ft a: 1260 m 3 b: 1584 cm a and b: See table and graph at right. c: The growth is non-linear and the rule is a function. The graph shows that the rule is not a line and there is onl one output for each input a: See graph at right below. b: For the first 3 hours, the graph is linear and increasing. The net segment is constant, or has a slope of 0 while the are resting. The last 2-hour segment is linear and decreasing a: 24 cups b: 40 cups c: c = 4t a: = = 128 b: + 88 = 180, = 98, corresponding s =, st.. Distance (miles from Sarah s house) Time (hours) CPM Educational Program. All rights reserved. Core Connections, Course 3

57 Lesson π in or approimatel units, the perimeter is irrational because the decimal does not repeat or terminate a: 25 6 b: 2 3ab c: 6m 4 n a: Cannot determine if similar. b: Similar b AA, = 7, = in Sample graphs: a: b: Selected Answers 2013 CPM Educational Program. All rights reserved. 57

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