7th Grade Math

Selected Answers and Solutions R27

Selected Answers and Solutions

For Homework Help, go to Hotmath.com

Pages 516–519 Lesson 9-3B

1.

AB

4%

B

10%

A

42%

O

44%

Blood Types in U.S.

3a. blue 3b. 40

5.

$BMJGPSOJB



'MPSJEB



5FYBT



Orange Production

7.

#PBSE



$BSE



%SBNB



4QPSUT



7JEFP



Favorite Games

99 a. Look at the title of the graph. It asks, “Do

Americans Favor Common North American

Currency?” The section that says “Yes” represents

the percent of Americans who do favor a common

North American currency. The number there is

43%. So, 43% of Americans favor common North

American currency. b. Let p represent the part

of the American people who would say “Don’t

Know”. Write an equation to fi nd the number.

p = 0.04 · 298,000,000 or about 12 million people do

not know if they favor a common North American

currency. c. Find the number of people opposed

to a common currency. 0.53 · 298,000,000 =

157,940,000 people opposed. Find the number of

people in favor of a common currency. 0.43 ·

298,000,000 = 128,140,000 people in favor. Find the

difference: 157,940,000 - 128,140,000 = 29,800,000

So, about 30 million people more are opposed to a

common currency than are in favor of it. 11. 40

13. circle graph
    Sports
    8%

Tanya’s Day

School

25%

Sleep

33%

Homework

12 %

Other

22%

1515 a.^366 +^126 +^10 =^502 15b. No; a 50%

increase in 126 students is 189 students and

189 students is not equal to 366 students. So, it is

not reasonable to say that 50% more students said

they could make a difference. Since 300% of 126 is

378, it is reasonable to say that 300% more students

said they could make a difference than those who

said they cannot make a difference.

17. 12.5%; English is half of the circle. Since Science
    is half of English, Science is half of 50% or 25%.
    Math is half of Science, which is half of 25% or
    12.5%. 19. No; Sample answer: The sum of the
    percents is greater than 100. The people surveyed
    must have been able to choose more than one fruit
    juice. 21. 16 23. 13

Pages 522–524 Lesson 9-3C

1. Sample answer:

State Population Density (per square mile)

Density Tally Frequency

0–199

⁄ ⁄ ⁄ ⁄

⁄ ⁄ ⁄ 

38

200–399 ⁄ 5

400–599  3

600–799  1

800–899  1

900–1,099  1

1,100–1,299  1

9

12

6

0

3

15

Number of States

18

27

30

24

21

33

36

39

42

Density (per square mile)

0–199200–399400–599600–799800–999

900–1,0991,100–1,299

State Population Density

R01_R42_EM_SelAns_895130.indd R27 1/18/10 9:51 AM