Maths, Addmaths and Statistics: Post your doubts here!

[Dukeofwin]

http://www.xtremepapers.com/papers/...Calculator Version) (4024)/4024_w11_qp_22.pdf
Please answer Question 6 part d) iii)

 

[MustafaMotani]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w06_qp_1.pdf
(12)(b) & (c), (20)(c)
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_s08_qp_1.pdf
(18)(b), (24)(a)(i)
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_s09_qp_1.pdf
(15)(c)
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w09_qp_1.pdf
(18)(b)(ii)
With method please.. Thank u in advance..

18 b) Earth ' s distance from Sun = 1.5 10^8 km
converting this to metres by multipling it with 1000 = 1.5 x 10^11
Converting it to terametres dividing by 10^12 = 0.15 terametres..

24 a i) first find Cf (cummulative frequency) for all number of books. this is done by adding frequencies.
e.g. Cf for 0 books wil be 10
CF for 1 book will be (10 + 11) 21
CF for 2 books will be (21 + 8) 29 and so on
median is (n+1)/2 value
n is total frequency .... it comes 50
median = 51/2 = 25.5 th value
now look in whch CF does this value lie
It lies in 29 so median will be 2 books

 

[Fallen316]

What is identity matrice in matrices topic!!???

|1 0|
|0 1|

 

[MustafaMotani]

how do they suppose we do that without a calculator! lol .. that part should be in paper 2.

xD u cant subtract 27 from 125 ??

 

[syed1995]

xD u cant subtract 27 from 125 ??

Not without a calculator!

 

[MustafaMotani]

Not without a calculator!

 

[MustafaMotani]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w11_qp_22.pdf
Please answer Question 6 part d) iii)

x cordinate of D is same as C i.e. 12 because it lie on line x = 12
then just insert x=12 in equation AB to find y codinate of D

 

[MustafaMotani]

12(b) BA = 3a -2c
OP= 2a- 4c/3

take comman= BA=3(a-2c/3)
OP=2(a-2c/3)

since the vectors are in the form k(x+y) they are parallel. as long as they are multiples of the same vector they are always parallel.

12(c) Sorry I have no idea about this one.

s08_qp_1.pdf

18 (b) nothing can be simpler than this! just divide by 10^12 so 1.5 x 10^8/10^12

answer will be 1.5 x 10^-4 or 1.5/10^4

24 (a) (i)

Number of Books = x
Frequency = f

formula for mean is sum of fx/sum of f.

so take fx
0*10+1*1+2*8+3*3+4*6... and so on.

and then divide it by sum of all the frequencies which is mentioned in the question (50 students)

you should now get the answer! won't calculate it .. will leave it to you.


s09_qp_1.pdf

15 (c) range is always the largest value - smallest value .. so in this case convert everything to seconds first .. 240-75 = 165 seconds .. which equals 2 minutes 45 seconds.

w09_qp_1.pdf

18 (b) ii its again ratios of areas .. which I don't know. Sorry.

see my post they would help u

 

[Spidey21]

What is identity matrice in matrices topic!!???

|1 0|
|0 1|

 

[Mayedah]

But how ? I dont understand ! Joining the points also gives me x=0 and x=-2 ! How do you know that its -1 ?

Brcause only the line x= -1 gives scale factor 2

 

[Talhakhan]

|1 0|
|0 1|

Man can u tell me what is the function of this..

 

[syed1995]

see my post they would help u

still didn't get them.

 

[MustafaMotani]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w06_qp_1.pdf
(12)(b) & (c), (20)(c)
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_s08_qp_1.pdf
(18)(b), (24)(a)(i)
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_s09_qp_1.pdf
(15)(c)
http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w09_qp_1.pdf
(18)(b)(ii)
With method please.. Thank u in advance..

15 c) range is largest time - smallest time
i.e. 4*60 - 75 = 165 seconds = 2mins 45 secs

18 b i ) PU : PV = 1 : 3 (i think u got it becox u didnt asked this )
bii) Ratio of triangles PST : PQR = 1 : 9
this means that PST represents 1/9 of PQR and rest of the trapezium shows 8/9 of PQR

so PQR : STRQ = 9 : 8

 

[MustafaMotani]

still didn't get them.

specify which.. ?

 

[Dukeofwin]

http://www.xtremepapers.com/papers/...Calculator Version) (4024)/4024_w11_qp_22.pdf
Question 9 b)

 

[Mayedah]

http://www.xtremepapers.com/papers/...Calculator Version) (4024)/4024_w11_qp_22.pdf
Please answer Question 6 part d) iii)

Extebd the line AB .draw a vertical line from C as said parallel to y axis .the point where two lines meet is point D ...coordinates (12,11)

 

[Mayedah]

http://www.xtremepapers.com/papers/...Calculator Version) (4024)/4024_w11_qp_22.pdf
Question 9 b)

See the next part its an angle in a semi circle so it will be 90 degrees !

 

[MustafaMotani]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w11_qp_22.pdf
Question 9 b)

ABP = BCQ (because u proved in prev part that APB and BQC are congruent)
APB = PBC (alternate angles)
if 180 - ABP - APB = 90
then 180 - BCQ - PBC =90 =BMC

 

[MustafaMotani]

See the next part its an angle in a semi circle so it will be 90 degrees !

xD are u serius.. ?

 

[syed1995]

specify which.. ?

ratio of areas with vectors.