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Mathematics: Post your doubts here!

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Layla..

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My Name said:
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w11_qp_42.pdf

question 1 part d
question 3 part a iii
question 6 part c
question 7 part b,f i and ii GRAPH I SSOOO weird
question 9 part a ii and b
Click to expand...
1 part d) 540(1+6%)^2 = 606.744
They say it was put 2 years ago means compound interest for 2 years has been given thus the formula
Q3 part aiii) Use englargement matrix and multiply it with the coordinates or make x and y lines at (4,5) and mark coordinates of the triangle along this line then simply mutiply coordinates by 1.5
 
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Layla..

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L

Layla..

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Layla..

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I AM SO SORRY
AN SO FREAKING OUT I POSTED THE WROND LINK !!!!
HOPE U WILLSTILL HELP
ME
ANS CONQUDINK i needed those answers tooo!!!!!!!!!!!!!!!!!!!
 
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Mai(M4!) said:
there is no part c for 1
3)b)volume=width*length*hieght=(9-2x)(7-2x)(x)
x(9*7+9*-2x+-2x*7+-2x*-2x)
63x-18x^2-14x^2+4x^3
=4x^3-32x^2+63x


4)b)pentagon=5 sides
n=5
180(n-2)=sum of interior angles
180*3=540


d)i)sum of interior angles of quadrilateral =360
4x-5+3y-20+2x+5+x+y-10=360
rearrange it to be 4x+2x+x+3y+y=360+5+20-5-+10
=7x+4y=390

(ii)as AD and BC are parallel then 2x+5+3y-20=180
rearrange it to be 2x+3y=180-5+20
2x+3y=195

(iii)2x+3y=195
7x+4y=390
you can use a lot of ways to answer a simultaneous equation but i enjoy the substitution the most
so here is it
y=(195-2x)/3
y=(390-7x)/4
(195-2x)/3=(390-7x)/4
65-2x/3=97.5-7x/4
7x/4-2x/3=97.5-65
x=32.5/(13/12)=(12*32.5)/13=30
y=(195-2*30)/3=45

(iv)use the answer in iii
it should be
65
65
115
115


5)b)ii)both uses the internet=3/5*3/4=9/20
Chaminda uses it=3/5*1/4=3/20
Niluka uses it=3/4*2/5=3/10
9/20+3/20+3/10=9/10


Q 6 no ii is found so i answered b
6)b)Surface area =circumference of biggest semi-circle*height+circumference of smallest semi-circle*height+circumference of semi-circle with diameter 17.5*height +area of cross section (solved in a )
1/2π (17.5+6.5)*35+1/2π(6.5)*35+1/2π (17.5)*35 +329.7=1/2π (17.5+6.5+24)*35+329.7=420π +306.25π +113.75π +329.7=840π +329.7=2968.6 but as it should be 3 s.f. so it is equal 2970



7)b)iii)x=8--4=8+4=12
y=14--4=14+4=18


no 10 v
Click to expand...

U MADE IT SEEM SOO EZ how long did it take u to do this!
 
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