Apps. and Interpretation for IBDP Maths Ebook 1 | Page 368

Your Practice Set – Applications and Interpretation for IBDP Mathematics
8.3 (a) ( � 5,12.5)
(b) r � 10 , a �� 0.5
8.4 (a) � 5
(b) r � 4, a �� 1
(c) t
Exercise 9
9.1 (a) � 9920
(b) p � 108
(c) 100
9.2 (a) 5400
(b) p � 28, q � 40
(c) (20, 5000)
9.3 (a) 9840
(b) 40 �x
� 80
(c) 40
(d) 60
9.4 (a) 20
(b) 16 �x
� 24
(c) 20
Exercise 10
10.1 (a) A � 600 �100x � 4x
(b) x � 3.5
(c)
3
1046.5 cm
10.2 (a)
2
x �38x� 325 � 0
(b) x � 25
(c)
2
$20 / cm
10.3 (a) $4.5
(b)
2
P � �15r � 45r
� 150
(c) $183.75
10.4 (a) 12 m
(b) 4 m
(c) 6.90 m
2
Chapter 5
Exercise 11
11.1 (a) a � 10
(b) b � 1.5
(c) y � 10
11.2 (a) p � 4
(b)
1
q �
2
(c) { y: y� 7}
11.3 (a) p � 2 , q �� 1
(b) x � 0.792
(c) 0
11.4 (a) a � 3, b � 4
(b) Increases
(c) 1
Exercise 12
12.1 (a) $18000
(b) $9560
(c) 9.31 years
(d) $2000
12.2 (a) 270
(b) 50
(c) 48.6 days
12.3 (a) The initial price of the
computer system
(b) A � 750
(c) 2.30 years
(d) EUR 90
12.4 (a) The initial amount of electric
charge stored
(b) p � 5 , q � 0.8
(c)
1.60 hours
Exercise 13
13.1 (a) 12
(b) 0.998 units
13.2 1000:1
358
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