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Ok. Some people have sent me some answers. Here they are. Good luck.
1. -30
2. $966
3. 4,4,5,10,12
- 119
5. (61x – 18) / 12
- (a) {4, 8} (b) shade outside the two ovals
7. (4x-3y)(a-2b)
8.(a) B(2,-2) (b) 6.71 units
9. Mean = 162 g; SD = 5.48 g
- $32680
-
45 deg, 27 deg, 108 deg
12 (ai) 1.5 L (ii) 4.5 L (b) 6:15:20
13. 5 hrs 52 min
14. (a) 2 x 3^2 x 5^2 (b) 90, 75
15. (a) 3 < x <= 8.5 (b) 4, 5, 6, 7 , 8
16. 216 deg
17 (a) 28.6 cm (b) 1.37
18. 141.9 deg
19. 716 cm squared
20 (a) (shown) [whatever that means] (b) (16, -5) (c) 160 sqr units
21 (a) q = (A-2(pi)p^2) / (pi)p (b) 3r
22(a) P=(1st row 4 2 3; 2nd row 3 0 4) (b) R = (1st row 15 -0.3; 2nd row 10.1 0.2)
22(c) $0.20 (d) $13.23
23 (a) I don’t have to show you (b) 3(pi)r2
24(a) (10-n)/10 (b) (90-19n+n^2)/90
24(c)(I) show it yourself (ii) 3
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