year 8 maths

651
Exercise 9C
1 a 3 kg b 4 kg c 5 kg d 4.5 kg
2
Dog’s weight
over time
b
Distance (km)
30
24
18
12
6
Weight (kg)
10
5
0
Jan
Feb
Mar
Month
Apr
May
3 a 45 cm b 110 cm c 8 years
d 15 cm
e 140 cm
4 a 23°C b 2 p.m. c 12 a.m.
5 a
d i 10°C ii 18°C iii 24°C iv 24.5°C
Weight (kg)
10
8
6
4
2
0
Jan
Feb
Mar
Apr
Weight of pet dog
May
JunJul
Month
Aug
SepOct
Nov
Dec
b Weight increases from January until July, then goes
down suddenly.
c July 1
d Completed on computer
6 a 200 km b 80 km c At rest
d In the first hour e 40 km
7 a 2 hours b 5 km c Fifth hour
8 a July
b From October until the following July
c 20 megalitres because the level stayed the same
d Southern Hemisphere because winter occurs in middle
of year.
9 a at 7 a.m. and 8 p.m. b at 8 a.m. and 11 p.m.
c i around 7 a.m. (heater goes on)
ii around 8 a.m. (turns heater off)
iii around 8 p.m. (heater put back on)
iv around 11 p.m. (heater turned off)
d Answers will vary.
10 a
300
240
180
120
60
Distance (km)
0
1 2 3 4 5
Time (hours)
11 a The city is in Southern Hemisphere because it is hot in
January/December.
b The city is quite close to the equator because the winter
temperatures are reasonably high.
c
Temperature in a year
40
35
30
25
20
15
10
5
0
Average temperature (°C)
Jul
Aug
Sep
Oct
Nov
Jan
Dec
Month
d Maximum occurs in the middle.
Feb
Mar
Apr
May
Jun
e It depends on what Month 1 means. If it means January,
then this is the Northern Hemisphere. If it means June,
then this is the Southern Hemisphere.
Exercise 9D
1 a playing sport
b watching TV
c more
2 a rugby b basketball c 1 d 2
5
3
3 a 20
3
b i
ii 1 iii 7 iv 1
10
4
20
10
c i 108° ii 90° iii 126° iv 36°
d France
USA
China
United
Kingdom
0
1 2 3 4 5
Time (hours)
Cambridge Maths NSW
Stage 4 Year 8 Second edition
ISBN 978-1-108-46627-1 © Palmer et al. 2018
Cambridge University Press
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