these are all the answers i got:
1. 4.8
2.17.4 (total mean)
3. a)30 mins
b)21 km
c)13.27 and 16.28 (what time 24km away)
d) 31.2 km/h
4. a) reflection x=1 b) rotation thing
5. 105 degrees (32tan70 something)
6. -2, 3.5 (simultaneous equation)
7. 2x2x3x5x5 (300 as product of prime factors)
8. 67 (total rain in janurary)
9.a) x+8
b) y^2 +2y-35
c) square root of v/pie times h
10.a) 78000
b) 5.4x10^5 (weight of space shuttle+station)
11. donut shape next to normal circle(sets a n c')
12. a) drew graph b) 2.4 (x^3-3X-1)
13. a) 3x^2 -3 (differentiate x^3-3x-6)
b) dy/dx=45
14. 18 people studied 1 language
15.a)32 degrees
b) 122 degrees (opposite angles in cyclic quad =180)
16. a) 7.27cm
b) 4cm (CHORDS)(7x12=6xXD, XD=10, DC=4)
17.a) 18% (HISTOGRAM)
b) 200 total ppl
18. probability=0.75
19.a) inverse function=(x+2)/3
b) gf(x)=10/3x
20. -1 or 8
21. r=2.5