Page 191 - TB_6B

Activity 3 P. 38~40 Unit 21. Positive Signs and Negative Signs
1. a. 3

b. 1 P. 42~43
The car’s position 10 minutes ago was at 20 km
0 from the origin.

The car’s position 10 minutes later will be at
20 km from the origin.

Time Distance Ricky Can Time Ricky’s
Position
c. 8 Travel in 1 Second (m) (+: later, -: ago)
9
00000 33

Future 3 26

3 1 3 1=3

Present (0) 3 00

3 13

Past 3 26

2. b. 1 c. 2 3 39
e. 8 f. 9
h. 9 i. 7 3 a = Ricky’s position
b . 1, 1, 4
3. a. 3 d . 8, 0, 2 Activity 1 b . 64 P. 44~45
c. 8 f . 15, 17, 11 e. 0
e. 6 e. e = 2 1 . a . 21 b . 60 c . 30
g. g = 7 d . 27 e . 360 f . 56
4. d. d = 3 i. i = 0 c . 675 c . 300
f. f = 3 2 . a . 180
h. h = 2 d . 90 d . 432

3 . b . 384

Activity 4 P. 41 Activity 2 P. 46~47

1. a. 5 b. 2 Total 1. a. 7 b. 8 c. 8
c. 5 d. 4 d. 9 e. 0 f. 1
4 g. 4 h. 3 i. 9
2. Round 1 Round 2 Round 3 2
6 2 . a . 32 b . 30, 60, 100
Thomas 5 4 5 0 c . 18
Ann 9 10 3 d . 6, 9, 11
Ricky 4 6 8 3 . b . 160
Sum 0 0 0 e . 16 c . 98 d . 19

4. b. b = 3 f . 45
e . e = 24
c. c = 7 d. d = 7

f . f = 18

180