Page 185 - TB_5B

3. a. 2 b. 12 c. 2 a Challenge P. 129
x y 10 1 . b . 3b and b
2 . c . 10a 5b c . 8x2 and 4x2
p 10 3 3 . b . 31
e. z f. 2 b d . 9x2 5x 10
d. 5

Activity 2 P. 126~128 c . 32 d . 63

17, 17
b, 9, 3, 3

1. b. x 3 6 3 3 Unit 31. Express the Data
c. 3
d . 14 P. 130~131

e. 9 f. 2 The students’ most favorite animal is dog, and
least favorite animal is bear.
80 Pop CDs were sold the most in May and June.
Ballad CDs were sold the least in May, and
2 . c . 2y 1 2 3 1 7 Hip-hop CDs were sold the least in June.
The students’ most favorite food is pizza, and
d . 1 e . 23 the least favorite food is hot dog.

f. 5 Favorite Foods

3 . a . Area of triangle 1 Food Number of Votes
2
base height Hamburger

ab 1 Chicken
2
Hot dog
1
2 ab (cm2) Pizza

b . Area of triangle 1 ab The students’ most favorite food is pizza, and
2 the least favorite food is hot dog.

Replace a with 4 and b with 3. Number of students Favorite Animals
Dog Bear
1 a b 1 4 3 6 (cm2) 16
2 2 12
8
4 . a . Area of trapezoid 1 4
2 0
base 1 base 2) height Eagle
y) m2) Tiger

x y) 10 1 The students’ most favorite animal is dog, and
2 the least favorite animal is bear.

x y) 5 5 x

b . Area of trapezoid 5 x y)

Replace x with 10 and y with 15.
5 (10 15) 5 25 125 (m2)

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