Page 203 - Mathematics_Form_3

Answers

Exercise 4.7 Exercise 4.9

1. 6,560 1. Tshs 1,348,320;
2. 4,194,300 Tshs 1,429,219.20
3. − 29,524 2. Tshs 480,244.29
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4. 5 3. Tshs 8,965, 840

5. 62 4. Tshs 25,154
5
7. (a) (5 − ) 1 5. Tshs 17,334,375
n
2 6. Tshs 629,059.60
( ) ( ) 1− 1 n+ 1 2 + n ( ) 2− n − 1 7. Tshs 1,000,000,00 (1.0 095) n
or
(b)
3 − 3 8. Tshs 4,776,209.20
1
(c) 1− 9. 14 years
2 n
( ) ( ) 1− 1 n+ 1 3 + n 1−− n 10. 9 years
( ) 3
or
(d) 11. Tshs 70070.84
324 324
12. 8 years
8. r = 2
9. G = − 5, r = 2 Revision exercise 4
1
10. n > 1 1. A = 3n − 2

11. r = 1 or −1 n
9 9 2. 35
12. (a) r = or r = − 2
10 10 3. n
8
(b) G = 8 or − 4. (a) 55  (b) 520 1
1
Mathematics for Secondary Schools 1. (a) 63 or − 6 63 7. (a) 36 or − 36; 45 1 − 1464.5
5. Tshs 9,720,000
(c) 79.587
n
1
6. G =
2
or

Exercise 4.8
n
n−
2
2

(b) 1,200 or 1,200;−
1,464
−
(b) 608 or −
608
8; 10−
8 or −
(c)
(c) 6 or −
8. 1, 2, 4, 8
2. 16
3. 49
x
(1( x− −
4. 25
10.
5. 10, 40 9. −432 x + 1 ) n )
6. 144 11. 2 5050
7. 150m 12. 220,500; 231,525
196 Student\s Book Form Three
18/09/2025 10:00:16
MATHEMATIC F3 SB.indd 196
MATHEMATIC F3 SB.indd 196 18/09/2025 10:00:16