Maths, Addmaths and Statistics: Post your doubts here!

[Saad Mughal]

1 Apply fundamental principle of proportion to find x when x/3 = 12/30
A 72
B 12.5
C 2
D 12

2 If (A – 3) : A = (A+6) : (A + 3), then A is

A -3/A
B -1/2
C -3/2
D -5/2

1 seems wrong, the value of x = 1.2 if proportionality is to be applied.

 

[Saad Mughal]

the polynomial x²+x+2 has no real roots.
check did u typed the question right?

Yeah, it should be x^2 + x - 2.

 

[zeekay132]

Plzz koi explain karde muje

 

[Zoya Shahab]

the polynomial x²+x+2 has no real roots.
check did u typed the question right?

Yes the question is right..

 

[Dawarkazi]

Please tell me how to get the answer of part bi, ii, iii .

thanku

 

[papajohn]

Please tell me how to get the answer of part bi, ii, iii .

thanku

To find the bi you first have to draw line parallel to CA that is BE..So a quadrilateral form which is trapezium.

 

[fatima0000]

hi can anyone please explain me Q no 3) part (a)(ii)
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w11_qp_22.pdf
thanks in advance

 

[TheStallion-Reborn]

guys help!!!! maths, may/june 2012 paper 21 question 11 part b sub part 3 http://papers.xtremepapers.com/CIE/...Calculator Version) (4024)/4024_s12_qp_21.pdf

 

[usama321]

hi can anyone please explain me Q no 3) part (a)(ii)
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w11_qp_22.pdf
thanks in advence

as the shaded area = one small circle. So the area of the five small circles pi r^2 + the five shaded region = pi R^2. that becomes 10 pi r^2 = pi R^2. Do the cutting, and the answer would be

R^2: r^2 = 10:1

 

[usama321]

guys help!!!! maths, may/june 2012 paper 21 question 11 part b sub part 3 http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_s12_qp_21.pdf

actually the point F is on the roof too. In the sec ond diagram, you must remember that it is a 3d question. Thus as BE is on straight roof, BF is also on straight roof. Now



Now bfa is our angle of depression alternate angle. So tan bfa= 15/11.77

 

[TheStallion-Reborn]

actually the point F is on the roof too. In the sec ond diagram, you must remember that it is a 3d question. Thus as BE is on straight roof, BF is also on straight roof. Now

View attachment 24067

Now bfa is our angle of depression alternate angle. So tan bfa= 15/11.77

thanku so much!

 

[TheStallion-Reborn]

http://papers.xtremepapers.com/CIE/...Calculator Version) (4024)/4024_s11_qp_12.pdf question nmbr 22 part a.. help please

 

[fatima0000]

http://papers.xtremepapers.com/CIE/...Calculator Version) (4024)/4024_w11_qp_22.pdf
Q no 3 (b)(ii)

 

[usama321]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w11_qp_22.pdf
Q no 3 (b)(ii)

from the previous diagram you can get AOB by dividing 360/5 = 72. Now, the OBC and OAC = 90 as they are both tangents touching the radius. So ACB= x

x+90+90+72=360
x=108

reflex ACB= 360-108 = 252

second part

5( 252/360 * 2pi r)

5(1.4* pi r)

7 pi r
k =7

 

[fatima0000]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_s11_qp_12.pdf question nmbr 22 part a.. help please

as its top vertex BOC is on the centre of circle so the triangle must be isosceles. thats why when OBC is equal to 20 then OCB must also be 20 and then:
20 + 20 + x = 180
40 + x = 180
x = 180 -40
x= 140

 

[fatima0000]

t

from the previous diagram you can get AOB by dividing 360/5 = 72. Now, the OBC and OAC = 90 as they are both tangents touching the radius. So ACB= x

x+90+90+72=360
x=108

reflex ACB= 360-108 = 252

second part

5( 252/360 * 2pi r)

5(1.4* pi r)

7 pi r
k =7

thanks for both of the answers

 

[fatima0000]

http://papers.xtremepapers.com/CIE/...Calculator Version) (4024)/4024_w11_qp_22.pdf
Q no 8 (a)(i)

 

[fatima0000]

http://papers.xtremepapers.com/CIE/...Calculator Version) (4024)/4024_w11_qp_22.pdf
Q no 9 (b)

 

[Saad Mughal]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w11_qp_22.pdf
Q no 8 (a)(i)

For $25, the value after 8 years is $62.
$500 investment is 20 times that of $25.
Therefore,
Value of $500 after 8 years = 62 * 20 = $1240.

 

[Saad Mughal]

Please tell me how to get the answer of part bi, ii, iii .

thanku

(b) (i) Trapezium is the answer, reason: BE = kq, this means that it will be a horizontal line similar to AC of longer/shorter length. If you draw it, you'll see that it's a trapezium.
(ii) AE = AB + BE = p + kq (triangle law)
(iii) DA = 3p + q
D, A and E are collinear,
Therefore,
AE = x DA (x is a constant)
p + kq = 3xp + xq
Comparing p,
1 = 3x
x = 1/3
Comparing q,
k = x
k = 1/3.