Page 452 - Math Smart - 7

Try and Apply (Pg 253)
a) third from top d) 1) $24 ii)$18
b) fifth from top e)i)2.5h ii)5.25h
c) second from top 3. a)D = 4f
d) sixth from top b) 40. 80. 120, 160, 200
e) first from top c) Refer to part 'f
f) fourth from top d) D = 3f
Check My Understanding Pg 254)
Time (s) 10 20 30 40 50
1. a)
Distance (m) 30 60 90 120 150

.1 =2
Distance that Joanne and Laura jog
X •-1
200

6 -5 -4 -3 -2 - 1 I
g ISO
oanne

100

b)

X =-3 xU

Time (s)
g) Laura
6 -5 -4 - 5 -2 -1
Check My Understanding (Pg 261)
1. a) i) 400,600,800. 1000,1200
ii) Refer to part 'clii'
b) i) 200, 300, 400, 500, 600
= -5
11) Refer to part 'clii'
c) 1) It will be in between the express train and goods
Check My Understanding (Pg 257) train
1. a)$4 b)$3 c)$1,$2 d) $2, $6 ii) 300, 450, 600, 750, 900
iii)
2. a) W-4h
Distance travelled
b) 8, 12, 16, 20
c) Anita's wages Express Train:
24
1
1
rgsS-country
!
rain I
7-
i
^ 400
18
-4
1 t- Goods Train
IS
/
/-
12-
4^
f-
/
Time (h)
d) i) The faster the speed of the train, the steeper the
V f- incline of the graph
ii) It would be a straight line
2. a) 14:00 b) 12.5 km c) 20 min d)30km
Hours (h)

Answers