Apps. and Interpretation for IBDP Maths Ebook 1 | Page 370

Your Practice Set – Applications and Interpretation for IBDP Mathematics
17.4 (a)
4
�
3
(b)
34
�
3
(c) � 960
Exercise 18
18.1 (a) 9.1 m
(b) 106 m
18.2 (a) n � 20
(b) 630
18.3 (a) $23700
(b) 160 m
18.4 (a) 74
(b) $91800
Exercise 19
19.1 (a) (i) u1 �3d
� 43
(ii) 80u1
�3160d
� � 5320
(iii) u1 � 52 , d �� 3
(b) u � �3n�
55
n
(c) 18
(d)
3 107
2 2
2
Sn
� � n � n
(e) n � 75
19.2 (a) (i) u1 �10d
� 17
(ii) 96u1
�4560d
� 4512
(iii) u1 � 9 , d � 0.8
(b) u �0.8n�
8.2
(c) 173
(d) 3177.6
(e) n � 101
n
19.3 (a) (i) u1 � 60 , u2 � 57
(ii) � 3
(b) 28
(c) (i) 60
3 123
(ii)
2 2
(d) n � 41
(e) 165
5 3
19.4 (a) (i) S1
� , S2
�
7 2
5 11
(ii) u1
� , u2
�
7 14
1
(iii)
14
(b) 45
(c) 306
(d)
1 9
un
� n�
14 14
(e) n � 29
Chapter 8
Exercise 20
20.1 (a)
1
r �
4
(b)
1
u8
�
16
(c) S12 � 1365
20.2 (a)
(b)
4
r �
3
7
�
n�1
u
n
2
Sn
� � n � n
�11217
(c) n � 8
20.3 (a) r � 1.25
(b) 9
(c) 34.1
20.4 (a) r � 1.6
(b) u8 � 40.27
(c) 7
360
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