answerkey

Answer Key

Lesson 1-1 Chapter 4 Review

1a. You know the number of species in ACROSS 1. 6ab3 3. ᎏ2baᎏ2 4. ᎏ81ᎏ1 5. ᎏ74ᎏ
each group. You need to find the total 8. ᎏ5yᎏx3 10. 56 12. ᎏ6xᎏy4 13. 48mn
number of species. b. Add the numbers 15. 30
for all groups. c. The total is 4,888,288
species. d. Round the number of species in DOWN 1. 60a4 2. 22 3. 21x3y4 6. 75
each group to the nearest thousand and
add. This gives an estimate of 4,889,000. 7. 15 9. x2y3 11. 6mn 12. x6 14. 83
This is close to the calculated answer. So
the answer seems reasonable. 1 3 2
32
Chapter 1 Review 6ab 2
81 ab2
1. 9 2. Ϫ10 3. 36 4. Ϫ3x ϩ 4 0 x
a 41 7
5. 5x Ϫ 2 y3
56 1
Drawing: ϩ( ϩ ) 105 116
47
85 9x

Lesson 2-1 2y m

1. 12 13 14

–4 –3 –2 –1 0 1 2 3 4 5 6 7 x46y 4 8mn

2. 6 153 0 3

–4 –3 –2 –1 0 1 2 3 4 5 6 7 Chapter 5 Review Answer Key

3. 1. Andrew: a ϭ 0.3; Nancy: n ϭ 0.25;
Jocelyn: j ϭ ᎏ25ᎏ; Samantha: s ϭ ᎏ11ᎏ0 ;
–4 –3 –2 –1 0 1 2 3 4 5 6 7 Mark: m ϭ ᎏ21ᎏ0
2. ᎏ21ᎏ0 , ᎏ11ᎏ0 , ᎏ14ᎏ, ᎏ13ᎏ0 , ᎏ25ᎏ
4. 3. Jocelyn ate the most, and Mark ate the
least. 4. Drawings may vary so long as
–4 –3 –2 –1 0 1 2 3 4 5 6 7 sizes of each slice are correct relative to
each other.
Chapter 2 Review
Chapter 6 Review
1st Play: 12; 28
2nd Play: Ϫ5; 33 1–15. Sample answers are given.
3rd Play: 18; 15 1. Kelton 2. 3 out of 4 3. Steve
4th Play: 16; Ϫ1 4. 2.5 5. Jack 6. $6.75 7. Monique
Yes. The negative number, Ϫ1, signifies a 8. 2 out of 5 9. Kelton 10. Kelton
touchdown. 11. 0.3 12. 90% 13. 0.4 14. 75%
15. ᎏ19ᎏ0 16. $14.40 17. 1020 were male.
Chapter 3 Review 18a. 17.5% 18b. 82.5%

1. 40 2. Ϫ50 3. 1200 4. 3850
5. 1925 6. 1975
Mrs. Acevedo was born in 1975, so subtract
that year from the current year to find her
age.

© Glencoe/McGraw-Hill 115 Glencoe Pre-Algebra

Answer Key

Chapter 7 Review 2. x-intercept: 1; y
y-intercept: 1 Ox
1. x Ͻ Ϫ1 2. x ϭ Ϫ8 3. x ϭ 4
4. x Ͻ 16 5. x Ͼ 16 6. x ϭ 6
7. x ϭ Ϫ27
The hidden picture looks like this:

3 6 11 3. x-intercept: 6; y
y-intercept: Ϫ4 O
2 4 10
1 7
5 98
x

13 14 16 17 20

12 19
18
27 15

24 30 4. x-intercept: 4; y
21 28 29 y-intercept: 2 O

22
23 25 26

x

32 34
31
33

Lesson 8-2 5. x-intercept: ᎏ23ᎏ; y
y-intercept: Ϫ2 Ox
4–6. Solutions will vary.

4. y 5. y

Ox

Ox

6. x-intercept: 2; y
y-intercept: 4

6. y

Ox 7. x-intercept: 3; Ox
y-intercept: 3 y
Lesson 8-3
y O x
1. x-intercept: 1ᎏ21ᎏ; Ox y
y-intercept: Ϫ3 8. x-intercept: Ϫ6;
y-intercept: 2 Ox

© Glencoe/McGraw-Hill 116 Glencoe Pre-Algebra

Answer Key

9. x-intercept: ᎏ12ᎏ; y Chapter 8 Review
y-intercept: Ϫ1 Ox
1. f(x) and g(x) 2. x ϭ Ϫ3 3. y ϭ 0
4. 1 5. f(x) only 6. Ϫ4

The solution to the puzzle is
BOILED EGGS.

Lesson 8-9 Chapter 9 Review

2. y 1–5. Sample answers are given.
1. Equation: 802 ϩ 302 ϭ c2
y=x–2
Solution: c ϭ 85.44 in.
O (1, –1) x Actual: 85.5 in.
y = –2x + 1 2. Equation: 482 ϩ 362 ϭ c2
Solution: c ϭ 60 in.
Lesson 8-10 6. y Actual: 36.13 in.
3. Equation: 162 ϩ b2 ϭ 192
2. y O Solution: b ϭ 10.25 in.
Actual: 12 in.
x 4. Equation: 742 ϩ b2 ϭ 802
Solution: b ϭ 30.40 in.
Ox Actual: actual diagonal was 38 in.

5. The solutions were different from the
actual measurements in most cases because
it was hard to get an exact measurement,
especially on the TV and bed.

7. y 8. y Lesson 10-3 6.
Ox
O x 5.

9. y 10. y 7. 8.
Ox
O x

11. y

Ox 117 Glencoe Pre-Algebra
© Glencoe/McGraw-Hill

Answer Key

Chapter 10 Review Lesson 12-3

136 38 45 115 4.
59 101 94 80
87 73 66 108 50 55 60 65 70 75 80 85 90 95 100
52 122 129 31
Lesson 12-6
Sum ϭ 334
1.
Chapter 11 Review
HT
Hat: 96 in3
Head: 216 in3 HT HT
Neck: 9 in3
Arm: 106 in3 3.
Torso: 1500 in3
Leg: 226 in3 123456
Foot: 90 in3
HTHTHTHTHTHT
Total volume ϭ 2665 in3
4.

bus walk

Lesson 12-1

1. 1 | 2 2 8 2. 8 | 1 ride bus walk ride bus walk

|2 | 27 |9| 1 Chapter 12 Review
| 3 | 59
3 10| 459
4 23 11 1–5. Sample answers are given.

4| 2 ϭ 42 12 0 1. Name

12| 0 ϭ 120 Mom Age
38
3. 5 | 1 3 7 9 4. 0 | 3 5 7
| | Dad 41
|6 | 138 |1| 0158 Me 13
| 12 Larry
7 2 8
8 19 30

90 3| 0 ϭ 30 Juanita 4
Grandma 63
9| 0 ϭ 9.0 Grandpa 68

5. 28 | 4|
|
29 | 2 Uncle Juan 25
30 579 Aunt Mary 30
Cousin Margarita
|31 | 6 2

32
33 2

28| 4 ϭ $28,400

Median price: $30,700; Choice of the
better representation will vary.

© Glencoe/McGraw-Hill 118 Glencoe Pre-Algebra

Answer Key

2. 6 || 38 7. y 8. y
5 | 1
4 | y=x2+3 x y = 2x 3 + 1

3 | 08 O Ox
|2 | 5
2| 5 ϭ 25.
13
0 248

range: 66; median: 27.5; upper quartile: Chapter 13 Review
41; lower quartile: 8; interquartile range:
33 1. 8 2. 32x15 3. 3x9 4. x ϩ 6y
5. Ϫ6a ϩ 8b Ϫ 1 6. 12x2 ϩ 15x
3. 7. x2 ϩ 6x ϩ 8 8. The student needs to
supply a polynomial with a degree of 4. To
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 find the degree of a polynomial, you must
find the degree of each term. The greatest
4. I think that the stem-and-leaf plot best degree of any term is the degree of the
models the data because it organizes the polynomial. Sample answer: x2 ϩ 2y4 has
data so you can easily see the range of ages a degree of 4 because the first term has
from least to greatest. a degree of 2 and the second term has a
5a. ᎏ110ᎏ 5b. ᎏ13ᎏ0 5c. ᎏ11ᎏ0 5d. 9 degree of 4; since 4 is greater, the degree of
the polynomial is 4. 9. The student needs
Lesson 13-6 2. y to supply two polynomials that when added,
have a sum of 4x ϩ 9. To add polynomials,
1. y you add the like terms. Sample answer:
(3x ϩ 5) ϩ (x ϩ 4); In this sentence,
y = x2 y = x3 3x ϩ x ϭ 4x and 5 ϩ 4 ϭ 9. 10. The
student needs to supply two polynomials
Ox Ox that when added, have a sum of Ϫx ϩ 7.
To add polynomials, you add the like terms.
3. y 4. y Sample answer: (2x ϩ 6) ϩ (Ϫ3x ϩ 1)
11. The student needs to supply two
y =x 2–2 x Ox polynomials that when subtracted,
have a difference of 3x ϩ 1. To subtract
O y = x3 – 1 polynomials, you subtract the like terms.
Sample answer: (6x ϩ 5) Ϫ (3x ϩ 4)
5. y 6. y 12. The student needs to supply two
polynomials that when multiplied, have
O x a product of x2 Ϫ 16. Sample answer:
(x ϩ 4)(x Ϫ 4)
Ox y = 2x 2

y = x 3 + 2x

© Glencoe/McGraw-Hill 119 Glencoe Pre-Algebra