Maths, Addmaths and Statistics: Post your doubts here!

[haha101]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w11_qp_12.pdf
question no 18 part b

for 2.5 hours she had a speed of 20 right !
so it means she travelled 50km !
50+150=200 km and total time is 7.5 hours
Speed = total distance /total time
= 200/7.5 = 26.67 Ans !

 

[haha101]

The b part is connected to part a !! the total time of the journey is 7.5 hours ryt !! for the first part of 5 hrs journey she travelled 150 km ~!! for the next 2.5 hours she will travel at 20 km/ h !! so distance would be = 20*2.5 = 50 km !! so now the average spped for the whole journey would equal = total distance / total time taken

which will be = 200/7.5 = 26.67 km / h !!

i haven't checked the mark scheme or anything + i am not sure i am ryt !! i tried to help !! do tell me whether its the rite answer or not

Please answer my question

 

[HarisLatif]

The b part is connected to part a !! the total time of the journey is 7.5 hours ryt !! for the first part of 5 hrs journey she travelled 150 km ~!! for the next 2.5 hours she will travel at 20 km/ h !! so distance would be = 20*2.5 = 50 km !! so now the average spped for the whole journey would equal = total distance / total time taken

which will be = 200/7.5 = 26.67 km / h !!

i haven't checked the mark scheme or anything + i am not sure i am ryt !! i tried to help !! do tell me whether its the rite answer or not

yes you are right! i did not look at the first part while doing the second part i have got it now and thankyou .

 

[ashiqbal]

some transformation notes over here:
http://www.mediafire.com/?pclpx4wu3rswc4v

 

[haha101]

some transformation notes over here:
http://www.mediafire.com/?pclpx4wu3rswc4v

Please answer my question !

 

[AlphaBeta]

answer explain for part 25 )b)

 

[AlphaBeta]

answer above

 

[AlphaBeta]

answer above

haha101 answer pls

 

[haha101]

haha101 answer pls

Its the marking scheme man ! Post the question paper

 

[AlphaBeta]

Its the marking scheme man ! Post the question paper

read above post(2 times above)

 

[Sarah22]

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

 

[MustafaMotani]

Q. Given that f(x)=2x^2-5x-7.
And then.......sketch the graph of y=|f(x)| for -2<=x<=4.5. How to remove this modulus sign???
MustafaMotani, bogus, syed1995 -plz help.

I dont get .. y u are removing modulus sign first drawthe curve with given range and then whatever is below x axis reflect it upwards

 

[AlphaBeta]

Its the marking scheme man ! Post the question paper

answer quickly

 

[asd]

some transformation notes over here:
http://www.mediafire.com/?pclpx4wu3rswc4v

Is that an inter book? or some local board book?
or some other o level reference book..

 

[syed1995]

answer quickly

(a) 1/2*u*20 =10u= D (Triangle area) at T=20
total distance left = 2D-D=D
u*x=D
u*x=10u
x=10

T= 20+10 = 30

(b) You will get the value of 100 .. by simple logic.

as the deceleration is half of the first part. so u/20 * 1/2 = u/40

it took 20 seconds to reach u. so it will take 40 seconds to reach 0 from u.

40+60=100s

100s pe speed zero hojati hai ..

100 - Time at which speed=u/4.

Time=Speed/Acceleration
Time=(u/4) / (u/40)
= u/4 * 40/u
= 10s

100-10=90s.

 

[Dukeofwin]

People please answer How to convert a Speed Time graph into A Distance Time graph!

 

[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..

12 b) BA = 3a - 2c
if u take out 3/2 common from BA u'l get
BA= 3/2 ( 2a - 4c/3) this means BA = 3/2 OP
this shows BA = kOP
thus BA and OP are parallel

12 c) if u take BA and OP as base of each triangles, u'll see that height of each triangles are same and so when you'll find ratio of areas u'll see that it is actually the ratio of their base.

0.5 x BA x h / 0.5 x OP x h
now replace BA wid 3/2 OP
ratio of areas will be 3/2

do tell me if I am ryt ?

20 c . ratio of volumes of X and C = 27 / 125
if X is 27 out of 125 then Y will be (125 - 27)
so ratio will be 27 : 98

 

[Talhakhan]

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

 

[syed1995]

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..

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.

 

[syed1995]

20 c . ratio of volumes of X and C = 27 / 125
if X is 27 out of 125 then Y will be (125 - 27)
so ratio will be 27 : 98

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