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Math P2 Oct/Nov 2001 HELP !!!

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Q80BOY:
IGCSE (CIE) Mathematics Paper 2 Oct/Nov 2001

(i've attached the question paper)

Page 3, Question 5 (Done)

Page 4, Question 9 (Done)

Page 5, Question 12 (Done)

Page 8, Question 19, Part (d) (Done)

Page 9, Question 20, Part (a) and (b) (Done)

Page 10, Question 22, Part (a) and (b) (Done)

Page 11, Question 24, Part (c) (Done)


Special thanks to Sanity_Master, Amber, Twilight and Sweetsh for their gr8 help !! 
keep up the good work !!  ;)

sanity_master:
Page 3, Q 5::

M.F (multiplying factor) = 99>>>>100%-1%

(99*4)÷100= 3.96 hours
3 hours......0.96 hours *60= 57.6 minutes
3 hours, 57 minutes.....0.6 min*60= 36 seconds
3 hours, 57 minutes, 36 seconds

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Page 4, Q 9::

X= 70*2 ==> 140 (degrees)

OSC = 90 (degrees)
so, Y= 90-40 ==> 50 (degrees)

OAC...X+2a=180...........the a is a virtual letter for the angle at OCA which is equal for OAC
a=20 (degrees)

SO, BCA = 40+20 ==> 60
AND, BAC = 180-60-70
BAC= Z+20
SO, Z+20=50
Z=30 (degrees)

Q80BOY:
Thanks very much Sanity_master !!! + rep !!  ;D

Christy:
Q9) x=140 degress (70*2)
      y= 50 ( 90 - 40)
      z= 30 ( 180 - 140 /2 = 20 and 40+20 = 60
                                                            60+70+20+x = 180
                                                                           x = 30 )  
Q12) a) 60 and 300
b) i think its is 270 <x<359

Q19) d) because BC is double of AQ

Q20) a) 70
b) 15.3cm ( 25/sin70 = x/sin35)

Q22) a) d= 42 ( 72-30)
           e= 74 ( 180-30 = 150+136= 360-286 = 74)
           f= 64 (180- [74+42])
b) 252 ( 180-136 = 44+64 = 180-108 = 72+180 = 252)

Q24) no .. the area under the graph is the distance so u use the formula :

1/2 * b * h
1/2 * 4 * 20 = 40 :D

couldnt do the first one sorry .. hope i helped    

sanity_master:
Page 5, Q 12::

(a) Cos(-) 1/2 = X

X=60
OR
X=300

(b) on the paper draw lines to show the part after 90 and below the half on Y and above 0.....

u will have the range......270<X<300
^^^^
i got it by calculation (trying, beside the drawing)

____________________________________________________________________________________________________________________
 sry, i g2g.......i hope i helped u :)

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