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Big Ideas Math Green Copyright © Big Ideas Learning, LLC Answers All rights reserved. A34
Extension 6.5 Warm Up For use before Extension 6.5
1–6.
Extension 6.5 Practice
1. a. ( )3, 2− b. ( )3, 2−
2. a. ( )5, 2 b. ( )5, 2− −
3. a. ( )3, 4− − b. ( )3, 4
4. a. ( )1, 4− b. ( )1, 4−
5. a. ( )3, 0 b. ( )3, 0−
6. a. ( )0, 6 b. ( )0, 6−
7. a. 1
2 , 42
−
b. 1
2 , 42
−
8. a. ( )2.5, 3.5− − b. ( )2.5, 3.5
9. a. 1 1
, 42 2
− −
b. 1 1
, 42 2
10. ( )5, 3− − 11. ( )3, 1− 12. 1
5, 42
− −
13. ( )1.5, 4− 14. ( )6, 2 15. ( )3.5, 8.5− −
16. a. ( )2, 1− b. 2 units
17. a. ( )3, 2.5 b. 6 units
18. ( )3, 4
19. a. ( ) ( ) ( ) ( )0, 0 , 5, 0 , 8, 2 , and 3, 2− −
b. ( ) ( ) ( ) ( )0, 0 , 5, 0 , 8, 2 , and 3, 2− − −
Technology Connection
1. 3 61 3 2 61 38 , 8, , 1.1, 1, , , , 8, 8
7 8 11 9 8 7− − − − − − −
2. 3 9 6 1 164 , 4.6, , 4, 0.98, 1, , 5.1, 5 ,
4 2 5 9 3− − − −
Chapter 7 7.1 Start Thinking! For use before Activity 7.1
Sample answer: You bought 3 pounds of apples at $2 a pound; The expression ( )3 2 equals 6.
7.1 Warm Up For use before Activity 7.1
1. 60 mi 2. 280 in. 3. 2 mi
7.1 Start Thinking! For use before Lesson 7.1
Answers will vary. Sample answer: Advantages are that you need to understand the problem in order to rewrite it, and the language is probably simpler and easier to understand. Disadvantages are that you may introduce errors by copying numbers incorrectly or not include all of the necessary information.
7.1 Warm Up For use before Lesson 7.1
Answers will vary. Sample answers: 1. How far do you walk for 30 minutes at 15 minutes
per mile? 2 mi
2. What is 2
3 of 99 pitches? 66 pitches
7.1 Practice A
1. Sample answer: You type at a steady rate of 20 words per minute for 48 minutes to enter your report on a computer. How many words long is your report? 960 words
2. Sample answer: A park is 6 miles from your home. You and your friend ride your bikes at a steady rate for one-half hour to get home from the park. What was your riding rate? 12 miles per hour
3. 16
4 16 or 4= ÷ =nn
4. 5 11+ =k 5. 2 7− =x
y
x−8−6−4 O 2
2
−4
−6
−8
8
4 6 8
TUX
Y W
V
Answers
Copyright © Big Ideas Learning, LLC Big Ideas Math Green All rights reserved. Answers
A35
6. 7 42=a 7. 1
63
= s
8. 13 17+ =t 9. 5 16− =b
10. 30 6= y 11. 7 4 or 47
÷ = =zz
12. 5 8+ =m
13. The number that should be multiplied by x is 8, not 24; 24 8= x
14. 217 36− =n 15. 4 72=n
16. 0.6 27=h
17. 4070 2710 8180+ + =p
7.1 Practice B
1. 17 41n= −
2. 168
168 14 or 14÷ = =xx
3. 17 153=s 4. 37 112+ =b
5. 23 61= ÷t 6. 114 37= +g
7. 46 33− =a 8. 1
225
=d
9. 9 36x = 10. ( )1108 12
2= x
11. ( )10 520 0.25=w
12. ( ) ( )2 25 12 10 23 200+ + + =p
13. 1 1 1
242 2 2
= +
h h 14. ( )6 27 8 626+ =m
15. a. Because 3 to 10 fibers are used for each thread, it isn’t possible to write an equation to find the exact total length of the fibers.
b. Sample answer: Using 6 fibers, an equation is
7.1 Enrichment and Extension
1. 2 7 23+ =n 2. 210 9− =p
3. 8− =x y 4. 2 2 4+ =x y
5. Maria
6. The variable x is not squared. The only number being squared is 2.
7. Sample answer: A number x plus 2 quantity squared is equal to 9.
8. Sample answer: Three minus a number x quantity squared is equal to 4.
7.1 Puzzle Time
IT SEEMS NO ONE CAN EAT JUST ONE POTATO SHIP
7.2 Start Thinking! For use before Activity 7.2
Sample answer: You can represent the situation with an equation. Assume that your scale reads 133 pounds for your combined weight and 100 pounds for your weight alone. Then you would solve the equation 100 133w+ = to find the weight w of your pet.
7.2 Warm Up For use before Activity 7.2
1. 5 2. 20 3. 15
4. 8 5. 0 6. 14
7.2 Start Thinking! For use before Lesson 7.2
Addition and subtraction are inverse operations. Multiplication and division are inverse operations. Inverse actions are:
1. Button 2. Descend 3. Withdraw 4. Turn on
Examples will vary.
7.2 Warm Up For use before Lesson 7.2
1. 3n = 2. 4r = 3. 3p =
4. 6t = 5. 7d = 6. 4x =
7.2 Practice A
1. yes 2. yes 3. no 4. no
5. 14=x 6. 12=y 7. 17=q
8. 36=f 9. 2=s 10. 4.9=r
11. 1.6=v 12. 1
3=n 13.
5
12=g
14. You must subtract 13 from both sides of the equation.
13 56
13 13
43
+ =− −
=
m
m
300 6.= ÷
Answers
Big Ideas Math Green Copyright © Big Ideas Learning, LLC Answers All rights reserved. A36
15. You must add 15 to both sides of the equation.
27 15
15 15
42
= −+ +
=
n
n
16. 20 8 ; 12= + =y y 17. 12 15; 3+ = =x x
18. 4 9; 13− = =g g 19. 10 3; 13− = =w w
20. Let x be the height of the desk in inches; 11 41; 30; 30 in.+ = =x x
21. Let h be the average height in inches of the Northern Mockingbird; 20 30;+ =h
10; 10 in.=h
22. Let p be the price of the cell phone before the rebate; 50 149;− =p 199; $199.=p
7.2 Practice B
1. yes 2. no 3. yes 4. yes
5. 13.4 2.6; 16− = =a a
6. 27 3.5; 30.5− = =h h
7. 46 2.5 ; 43.5= + =z z
8. 4.7 10.9; 6.2+ = =b b
9. 208=x 10. 103=j 11. 1
5=a
12. 28=n 13. 59=v 14. 47=c
15. 61=y 16. 84=e 17. 5=
18. 13 5 30; 12; 12 in.+ + = =x x
19. 10 15 10 43; 8; 8 m+ + + = =x x
20. 5 5 16; 6 ft+ + = =x x
21. a. 1.56 2.19,m − = 3.75, $3.75;=m
2.36 3.75, 1.39, $1.39;+ = =e e
3.20 1.39, 4.59, $4.59− = =c c
b. $0.08
22. 10 5.80 33.19; 48.99; $48.99− − = =c c
7.2 Enrichment and Extension
1. yes 2. no 3. yes 4. no
5. no 6. no 7. yes 8. yes
9. Sample answer: 3 13 and 7 17+ = + =x x
10. Sample answer: 2 5 and 4 3− = − =x x
11. 8 10 9 3 40; 10+ + + + = =x x
12. 3 1
2.5 1 3 2 12; 2.54 4
+ + + + = =x x
7.2 Puzzle Time
MICE KRISPIES
7.3 Start Thinking! For use before Activity 7.3
Sample answer: Your friend has 4 movie tickets and together you have 12 tickets. How many movie tickets do you have?
7.3 Warm Up For use before Activity 7.3
1. 3x = 2. 8y = 3. 24z =
4. 28a = 5. 13b = 6. 16c =
7.3 Start Thinking! For use before Lesson 7.3
Sample answer: If you know the distance and time it takes, you can plug in the distance d and time t into the equation d rt= and solve for r. If you want to find the rate in miles per hour, be sure to use distance in miles and time in hours.
7.3 Warm Up For use before Lesson 7.3
1. 41x = 2. 2w = 3. 11b =
4. 42v = 5. 60p = 6. 104k =
7.3 Practice A
1. 18=x 2. 16=t 3. 80=w
4. 42=s 5. 3=a 6. 5=d
7. 3=m 8. 2=g 9. 8=y
10. 21=n 11. 44=v 12. 35=c
13. 11=b 14. 150=h 15. 2.5=k
16. 30=r
Answers
Copyright © Big Ideas Learning, LLC Big Ideas Math Green All rights reserved. Answers
A37
17. Both sides should be divided by 9.
39
9 9 39
27
=
• = •
=
x
x
x
18. Both sides should be divided by 4.
4 32
4 32
4 48
• =• =
=
zz
z
19. 36 4 ; 9 students= s 20. 384 12 ; 32 weeks= w
21. 352; 2816 calories8
=c
22. 7.25; 58 points8
=s
23. 36 576; 16 cm;=w the area is given in square
centimeters, and the length is given in centimeters, so the width must be in centimeters also.
7.3 Practice B
1. 13=a 2. 140=s 3. 4=p
4. 108=g 5. 108=v 6. 6.5=x
7. 61.56=c 8. 9.5=b 9. 7 units=x
10. 14 units=x 11. 5 unitsx =
12. Use the perimeter formula, 4 ,P s= to write an equation, then solve for s. The side length is 25 yards.
13. Sample answer: The price of gas is $3.299 per gallon;
3.299; 49.485;15
= =p p it costs $48.49 to fill the
empty tank.
14. 20% 15. 16 cups
16. $2.70; Sample answer: Write and solve an equation to find the weight w of each biscuit: 25 0.75;=w
0.03 lb.=w Multiply to find the weight of
40 biscuits; ( )40 0.03 1.2 lb.= Then multiply
to find the price of 1.2 pounds of biscuits: ( )1.2 2.25 $2.70.=
7.3 Enrichment and Extension
1. 7
9 2.
2
3 3.
4
11
4. 17
33 5.
43
99 6.
1
11
7. 89
499
8. 245
333 9.
29
999
10. Let 0.23.
10 2.333
0.2333
9 2.1
90 21
90 21
90 907
30
==
− ===
=
=
xxxxxx
x
7.3 Puzzle Time
IF THIS HEAVY RAIN KEEPS UP MY NAME WILL CHANGE AND I WILL BE CALLED MUD
7.4 Start Thinking! For use before Activity 7.4
Sample answer: The cost of seven zoo tickets is $42. How much does each ticket cost?
7.4 Warm Up For use before Activity 7.4
1. 5x = 2. 7y = 3. 39z =
4. 8a = 5. 3b = 6. 8c =
7.4 Start Thinking! For use before Lesson 7.4
The variable y depends on x. So, the independent variable is x and the dependent variable is y.
7.4 Warm Up For use before Lesson 7.4
1. 2 12;P w= + The perimeter P depends on the
width w of the parallelogram.
2. 9 ;A w= The area A depends on the width w of the
rectangle.
3. 6 ;A h= The area A depends on the height h of the
triangle.
Answers
Big Ideas Math Green Copyright © Big Ideas Learning, LLC Answers All rights reserved. A38
7.4 Practice A
1. 2 8; perimeter;P w P= + = width of side;w =
P depends on the value of .w
2. 5 ; area; height;A h A h= = = A depends on the
value of .h
3. no 4. yes 5. yes 6. yes
7. The length is the independent variable. The perimeter P is the dependent variable.
8. The number of pianos p is the independent variable.
The number of keys k is the dependent variable.
9. a. 3 2f g= +
b. The number of guests g is the independent
variable. The number of food items f is the
dependent variable.
10. a. 300 10t m= −
b. The number of members m is the independent variable. The number of remaining tickets t is the dependent variable.
11. ( )2, 9 12. ( )3, 6
13. Sample answer: 2y x= +
14. Sample answer: 4 1y x= −
7.4 Practice B
1. 16 2 ; perimeter;P b P= + =length of base;b = P depends on the value of .b
2. 2 ; area; base;A b A b= = = A depends on the
value of .b
3. Both x and y were given the value of 2, but y gets the value 6.
( )( )
( )
5 4; 2, 6
6 5 2 4
6 6
2, 6 is a solution.
y x= −
= −
=
4. Sample answer: the amount of money you earn
5. Sample answer: the number of stores where you shop
6. a. 14 2c v= +
b. The number of additional video rentals v is the independent variable. The monthly cost c is the dependent variable.
7. ( )0, 5 8. ( )2, 3
9. 96 emails
7.4 Enrichment and Extension
1. The solutions are ( ) ( )9, 20 and 3, 2 .A C
2. The solutions are ( ) ( )7, 2 and 10, 5 .B C
3. The solutions are ( ) ( ) ( )0, 2 , 2, 1 and 4, 0 .A B C
4. The solutions are ( ) ( )25, 40 and 10, 10 .B C
7.4 Puzzle Time
MUSSELS
y
x1210
2
4
6
8
10
12
14
16
18
20
14 16 18 202 4 6 8
A(9, 20)
C(3, 2)
y
x65
1
2
3
4
5
6
7
8
9
10
7 8 9 101 2 3 4
B(7, 2)
C(10, 5)
y
x3
1
2
3
4
5
4 51 2
B(2, 1)
A(0, 2)
C(4, 0)
y
x30
10
20
30
40
50
40 5010 20
A(25, 40)
C(10, 10)
Answers
Copyright © Big Ideas Learning, LLC Big Ideas Math Green All rights reserved. Answers
A39
7.5 Start Thinking! For use before Activity 7.5
Equality means equal, in- means not; Sample answer: inaccurate, inappropriate, inattentive, incombustible, incompatible, incomplete, inconsiderate, inconsistent, incorrect, incurable, indefinite, independent, indestructible, indirect, inedible, ineffective, inexpensive, inflammable, informal, insane, insignificant, invisible
7.5 Warm Up For use before Activity 7.5
1. < 2. > 3. <
4. > 5. = 6. <
7.5 Start Thinking! For use before Lesson 7.5
Sample answer: A speed limit is the fastest that you are allowed to drive; in a school zone, the speed that you are allowed to drive can be written using the inequality 15.≤s
7.5 Warm Up For use before Lesson 7.5
1. B 2. C 3. A 4. D
7.5 Practice A
1. 2 > v 2. 15≤h 3. 1
2<p
4. 12 < n 5. 3
5≥ a 6. 17≤b
7. 6 12+ ≥x 8. 7 10− >k
9. solution 10. not a solution 11. not a solution
12. not a solution 13. solution 14. solution
15.
16.
17.
18.
19.
20.
21.
22.
23.
24. Let p be the number of people that the lifeboat can carry; 24.≤p
25. a. 16 50≤u
b. no; Sample answer: 4 is not a solution of 16 50.≤u
26. a. Let w represent the number of pounds of potatoes the box can hold; 25;≤w
b. yes
c. Sample answer: any number greater than 25
7.5 Practice B
1. 3.5 21≥b 2. 9 4÷ >y 3. 1
04
− ≤h
4. 2.56 10.24+ ≥w 5. 6 12<c
6. solution 7. not a solution 8. not a solution
9. solution 10. not a solution 11. solution
12. Sample answer: 2;x < A number x is less than 2.
13. Sample answer: 1;k ≥ − A number k is at least 1.−
14.
15.
16.
17.
18.
19.
20. Let h be the height of a vehicle that can travel on the highway; 7.75;<h
21. a. Scrambler: 48;≥h Busy Boats: 48≤h
b. 48 inches
22. numbers that are greater than 2 and less than or equal to 8
0 1 1 213
23
13 12
3
−2−3 −1 0 1 2 3
0 1 2 3 4 5 6
0 5 10 15 20 25 30
−7−8−9−10−11 −6 −5
−12−18−24 −6 0 6 12
0 2 4 6 8 10
−2−3 −1 0 1 2 3
0 1 2 3 4 5 6
−2−3 −1 0 1 2 3
2 3 4 5 6 7 8
−2 −1 0 1 2 3 4
−2 −1 −−−1−1 013
23
13
23
3 4 5 6 7 8 9
−2−3 −1 0 1 2 3
−56−57−58−59−60 −55 −54
−2−3 −1 0 1 2 3
Answers
Big Ideas Math Green Copyright © Big Ideas Learning, LLC Answers All rights reserved. A40
7.5 Enrichment and Extension
1. 1, 2, 3, 4, 5 2. 3, 4, 5, 6, 7, 8
3. 4, 5, 6, 7, 8, 9, 10 4. 1,− 0, 1, 2
5. D 6. C 7. A 8. B
9.
10.
11.
12.
13.
14.
15.
no; The two inequalities that make up the compound inequality do not share a common solution.
7.5 Puzzle Time
COTTAGE CHEESE
7.6 Start Thinking! For use before Activity 7.6
Sample answer: You have less than the required 20 paid rentals to get a free rental.
7.6 Warm Up For use before Activity 7.6
1.
2.
3.
4.
5.
6.
7.6 Start Thinking! For use before Lesson 7.6
2 22; 20x x+ ≤ ≤
7.6 Warm Up For use before Lesson 7.6
1. 4;x <
2. 9;h >
3. 5;y ≤
4. 15;p ≥
5. 11;≤k
6. 6;b >
7.6 Practice A
1. 11;n ≥
2. 4;v ≤
3. 1;p <
4. 11;x >
5. 5;k >
6. 1;m ≥
7. 20;h ≤
8. 2;b <
9. 100;w ≤
4 5 6 7 8 9 10 11 12
−2 0 2 4 6 8−4
−2 0 2 4 6 8−4
−2 0 2 4−4−6−8
0 2 4 6 8 10 12
0 5 10 15 20 25 30
0 2 4 6 8 10 12
8 9 10 11 12 13 14
0 1 2 3 4 5 6
−2 −1 0 1 2 3 4
17 18 19 20 21 22 23
97 98 99 100 101 102 103
10 32 4 5 6 7−1
1 32 4 5 6 7 8 9
10 32 4 5 6 7−1
−4 −3 −2−7 −6 −5 −1 0 1
100 3020 40 50 60 70 80
−4 −3 −2 −1 0 1 2 3 4
−2 0 2 4 6 8−4
−2 0 2 4 6 8−4
−2 0 2 4 6 8−4
−2 0 2 4 6 8−4
0 2 4 6 8 10 12
0 2 4 6 8 10 12
−2 −1 0 1 2 3 4
8 9 10 11 12 13 14
0 1 2 3 4 5 6
−1 0 1 2 3 4 5
Answers
Copyright © Big Ideas Learning, LLC Big Ideas Math Green All rights reserved. Answers
A41
10. 9;a ≥
11. 2;r >
12. 70;y <
13–16. Choice of variables may vary.
13. 6 10; 4+ ≤ ≤d d 14. 4 3; 7− > >x x
15. 0.6 2.4; 3≥ − ≤n n
16. 14 18; 4+ ≥ ≥z z
17. The inequality sign should not change; 7 or 7.> <g g
18. Five should be subtracted from both sides of the equation.
5 11
5 5
6
+ ≥− −
≥
x
x
19. Let d be the amount you can spend on the cold drink: 6.75 10; 3.25;+ ≤ ≤d d You can
spend up to $3.25.
20. Let n be the number of days for your books to arrive; 9 28; 19;+ ≥ ≥n n at least 19 days.
21. Let p be the number of people who can attend the play; 185 480; 295;+ ≤ ≤p p at most
295 people.
7.6 Practice B
1. 3;x ≥
2. 12;c <
3. 11;q >
4. 31.6;t ≤
5. 3
13 ;8
z >
6. 3
;5
g ≤
7. 0;k ≥
8. 2
5 ;3
x <
9. 1
;6
u ≤
10. 132;y <
11. 3
;8
d ≤
12. 4.4;h >
13–17. Choice of variables may vary.
13. 4.5 8; 12.5− > >k k
14. 3 1
2; 14 4
+ ≤ ≤x x
15. 9.1 4.6; 13.7− < <m m
16. 7 1 1
3 ; 412 2 12
− ≥ ≥n n
17. 1 1 3
5 2 ; 34 10 20
> + <y y
876 9 10 11 12
0 1 2 3 4 5 6
−2−3 −1 0 1 2 3
−1 0 1 2 3 4 5
67 68 69 70 71 72 73
8 9 10 11 12 13 14
8 9 10 11 12 13 14
29 30
31.6
31 32 33 34 35
11 12 13
13
14 15 16 17
38
−1−2 0 1 2 3 4
35
2 3 4 5 6 7 8
523
−2−3 −1 0 1 2 3
16
130 131 132 133 134 135 136
−2−3 −1 0 1 2 3
38
0 1 2 3 4 5 6
4.4
Answers
Big Ideas Math Green Copyright © Big Ideas Learning, LLC Answers All rights reserved. A42
18. 1;a <
19. 5.5;n >
20. 26.6;v ≥
21. Let d be the number of degrees the temperature must rise; 135 165; 30;+ ≥ ≥d d at least
30 degrees.
22. Let n be the number of additional phone numbers; 21 50; 29;+ ≤ ≤n n up to 29 additional phone
numbers.
23. 1.1
7.6 Enrichment and Extension
1. 3 6;x< <
2. 0 4;x≤ ≤
3. 7 11;x< ≤
4. 4 8;x≤ <
5. 4 or 6;x x< >
6. 3 or 5;x x≤ ≥
7. 7 or 0;x x≥ <
8. 3 or 4;x x< ≥
9. The solution is the entire number line.
7.6 Puzzle Time
I’M SORRY SIR SAID THE ATTENDANT THE MOON IS FULL RIGHT NOW
7.7 Start Thinking! For use before Activity 7.7
Sample answer: Each has 5x on the left-hand side and 20 on the right-hand side of the equation or inequality. To solve 5 20,x = divide each side by 5. The solution is 4.x =
7.7 Warm Up For use before Activity 7.7
1. 2x < 2. 24y > 3. 13r ≤
4. 13c ≥ 5. 5s < 6. 5x ≤
7.7 Start Thinking! For use before Lesson 7.7
Sample answer: This week, Shelley hopes to spend less than $3.50 on text messages. If each text message costs $0.20, what are the possible numbers of text messages Shelley should send this week?
7.7 Warm Up For use before Lesson 7.7
1. 8;x >
2. 2;t ≥
3. 9;n ≤
4. 3;f <
5. 6;b >
6. 0;y ≤
7.7 Practice A
1. 18;b >
2. 8;w <
3. 10;p ≤
10 32 4 5 6 7−1 0 2 4 6 8 10 12
0 2 4 6 8 10 12
−2 0 2 4 6 8−4
8 9 10 11 12 13 14
−1−2 0 1 2 3 4
2 3 4 5 6 7 8
5.5
24 25 26 27 28 29 30
26.6
10 32 4 5 6 7−1
4 5 6 7 8 9 10 11 12
4 5 6 7 8 9 10 11 12
1 32 4 5 6 7 8 9
1 32 4 5 6 7 8 9
10 32 4 5 6 7−1
10 32 4 5 6 7−1
0 2 4 6 8 10 12
0 2 4 6 8 10 12
0 2 4 6 8 10 12
15 16 17 18 19 20 21
5 6 7 8 9 10 11
Answers
Copyright © Big Ideas Learning, LLC Big Ideas Math Green All rights reserved. Answers
A43
4. 36;n ≥
5. 20;x >
6. 5;a <
7. 84;g ≤
8. 153;k ≥
9. 0;h ≤
10. 25;v ≥
11. 3;t >
12. 35;m <
13. 8;y ≥
14. 60;r ≤
15. 78;c <
16. 7;s >
17. 4; 5614
≥ ≥q q 18. 21 126; 6≤ ≤u u
19. 7 12; 84÷ ≥ ≥z z 20. 22 5; 110÷ > >a a
21. 13 117; 9≤ ≤g g
22. You must divide both sides by 5.
5 10
5 10
5 5
2
<
<
<
xx
x
23. You must divide both sides by 2, not subtract 2.
2 28
2 28
2 214
≥
≥
≥
nn
n
24. Let b be the number of bags of soil the wheelbarrow can carry; 20 300; 15;≤ ≤b b
at most 15 bags of soil.
25. Let be the length of the table; 3 24; 8;> ≥
at least 8 feet.
26. Let s be the number of steps; ( )8 10 12 ; 15;≥ ≥s s
at least 15 steps.
7.7 Practice B
1. 8;m ≤
2. 5;v ≥
3. 1
;4
b >
4. 1
7 ;2
x <
5. 2.5;h ≥
6. 126;u ≤
7. 12.4;r <
33 34 35 36 37 38 39
81 82 83 84 85 86 87
150 151 152 153 154 155 156
−2−3 −1 0 1 2 3
22 23 24 25 26 27 28
4 5 6 7 8 9 10
56 57 58 59 60 61 62
6 7 8 9 10 11 12
432 5 6 7 8
122 123 124 125 126 127 128
17 18 19 20 21 22 23
0 1 2 3 4 5 6
0 1 2 3 4 5 6
3332 34 35 36 37 38
7675 77 78 79 80 81
4 5 6 7 8 9 10
−1 − 1 212
12 11
20
14
4 5 6 7 8 9 10
712
−2 −1 0 1 2 3 4
2.5
12 12.2 12.4 12.6 12.8 13 13.2
Answers
Big Ideas Math Green Copyright © Big Ideas Learning, LLC Answers All rights reserved. A44
8. 2.4;a >
9. 9;p >
10. 7
;10
k <
11. 40.5;y ≤
12. 0.5;g ≥
13. 1
7 ;2
n <
14. 8;c >
15. 2.5;s ≥
16. 3.6;w ≤
17. 10 2.01; 0.201≥ ≥q q
18. 2
18 ; 123
÷ ≤ ≤z z
19. 3.43; 27.448
≤ ≤d d
20. 5 12; 2.4> >t t 21. 1 1
3 ;12 4
÷ < <b b
22.
23.
24.
25.
26. Let x be each person’s share of the rental cost each month; 3 1200; 400;≥ ≥x x at least
$400 per month.
27. Let m be the number of minutes required to print a 380-page report; 80 380; 4.75;≥ ≥m m at least
4.75 minutes.
28. Let r be the number of rest stops in 200 miles of highway; 25 200; 8;≥ ≥r r at least 8 rest stops.
7.7 Enrichment and Extension
1. 2 6;x< <
2. 3 5;x≤ ≤
3. 12 24;x≤ <
4. 6 8;x< ≤
5. 5 or 4;x x> <
6. 3 or 6;x x≤ ≥
7. 10 or 4;x x> ≤
8. 2 or 3;x x< ≥
9. The graphs for Exercises 1–4 share common solutions. The graphs for Exercises 5–8 do not.
7.7 Puzzle Time
ONE PAW AND MAW
Technology Connection
1. 7x = 2. 4t = 3. 20y = −
4. 6n = − 5. 42r = 6. 18x =
3.43.23.0 3.6 3.8 4.0 4.2
−1 0 1 2 3 4 5
10 32 4 5 6 7−1
10 32 4 5 6 7−1
2 2.2 2.4 2.6 2.8 3 3.2
876 9 10 11 12
0 0.2 0.4 0.6 0.8 1 1.2
710
38 39 40 41 42 43 44
40.5
−2−3 −1 0 1 2 3
0.5
4 5 6 7 8 9 10
712
5 6 7 8 9 10 11
−2 −1 0 1 2 3 4
2.5
876 9 10 11 12
43 5 6 7 8 9
4 5 6 7 8 9 10
10 32 4 5 6 7−1
−4 0 4 8 20 24 2812 16
4 5 6 7 8 9 10 11 12
10 32 4 5 6 7−1
3 4 5 6 7 8 9 10 11
10 32 4 5 6 7−1