**Unformatted text preview: **' MiniHSC 1 i) 4Â§+VIÂ§2=242+41I2=642
ii) (343?: 9x3 = 27 V13 2 ->sinB-'2â€”
HIE
I
3
. 2_x_ _ a-
1) 3 â€” 14 â€”> 3(3)â€”3(14) => 2x : 42 => x=21
2
ii) x-5x-6=0=> (x-6)(x+1)=0 =>x=-1,6
iii) lxl =6 => X=:t6
. 1:1. 2 _
1) dx(4x-x)â€”4-2x
.. _d_ _1v2_1-1/2__1_
11) (â€œ(15K) â€” dx(x )- 2x â€” 2â€˜];
iii) i(6+5x)=2(6+5x).5 =10(6+5x) dx
2
i) y=6x-x
$26-2x =6-10,atx=5
x ii) y-5 =-4(x-5)
iii) Wheny=0: 0-52-4(x-5) => x = 6% cuts x-axis at A(6iâ€˜ ,0) Whenx=0: y-5=-4(0-5) => y = 25 cuts y-axis at B(0,25) 2 iv) Area AOAB = %(6%)(25) = 78% u
Angle AGE 2 112Â°,
BCD is a straight angle (= 180Â°)
Angle ABC = angle BAC = xÂ°, base
angles isosceles AABC x + x + 112 = 180, angle sum AABC
x = 34Â° Let my height a year ago be x cm
Then 1.02(x) = 147.9 x = 145cm _ .â€˜I 2 2
1) AB: (2-12) +(3-5) = 4100+4
= Â«I104 = 24:26 ii) M = (average of x's, average of y's)
2 + 12 3 + 5
= 2 9 2 ) : (7â€™4) iii) m=m=ï¬=Â§ i) a=3andd=9-3=6
ii) Tn: a+(n-l)d
T10: 3+(10-1)6 = 57
iii) Sn: Â§[2a+(n-1)d]
s10: '122[6+(10-1)6] = 300 10 11 12 ii)
ax ii iii) 2 2
+bx = 3x(x+2)=>ax +bx = 3x +6x a = 3, b = 6 by equating co-eï¬‚icients. False ii) False
True iv) False ...

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- Spring '14