Maths, Addmaths and Statistics: Post your doubts here!

[xhizors]

Re: O'level Maths, Addmaths and Statistics help available he

sorry but they are C (4, 6)
and my Q's ans are ryt (8.5,0)

 

[tahatehseen]

Re: O'level Maths, Addmaths and Statistics help available he

what is the number of the question and what year?

 

[tahatehseen]

Re: O'level Maths, Addmaths and Statistics help available he

sorry but they are C (4, 6)
and my Q's ans are ryt (8.5,0)

Equation Of AB:
m=(9-10/8+4)=3/4
y=mx+c
Put the values of A
0=3/4(-4)+c
c=3
y=(3/4)x+3

(m of PQ)(m of AB)=-1
m of PQ=-4/3
y=(-4/3)x+c

Substitute values of P

10=-4/3 +c
c=34/3
y=(-4/3)x+34/3
Line AB and PQ intersect at C

Solve the two simultaneous equations..
4y=3x+12
and y=(-4/3)x+34/3
-16x/3 + 136/3 = 3x + 12
-16x+136=9x+36
25x=100
x=4, y=6
Therefore coordinates of C are (4,6)
It was a small mistake in the end!
HOPE THAT HELPED!!

 

[tahatehseen]

Re: O'level Maths, Addmaths and Statistics help available he

hey plz tell me that how to covert a decimal value into that radian π???
n for paper 1 r u doin the prac of p1 from pst paprs or both p1 n p2?????

i think u mean how to convert degree into radian...
for that if u have for example 60' (degrees)
60*(pi/180)=pi/3

nd the topix in add maths are almost same for both paper 1 and paper 2..so u cud prepare from both!

 

[xhizors]

Re: O'level Maths, Addmaths and Statistics help available he

sorry but they are C (4, 6)
and my Q's ans are ryt (8.5,0)

Equation Of AB:
m=(9-10/8+4)=3/4
y=mx+c
Put the values of A
0=3/4(-4)+c
c=3
y=(3/4)x+3

(m of PQ)(m of AB)=-1
m of PQ=-4/3
y=(-4/3)x+c

Substitute values of P

10=-4/3 +c
c=34/3
y=(-4/3)x+34/3
Line AB and PQ intersect at C

Solve the two simultaneous equations..
4y=3x+12
and y=(-4/3)x+34/3
-16x/3 + 136/3 = 3x + 12
-16x+136=9x+36
25x=100
x=4, y=6
Therefore coordinates of C are (4,6)
It was a small mistake in the end!
HOPE THAT HELPED!!

thanks budyy it really does Alhamdullilah and little help in it too Q11 ii a little explanation for k i have done with n
http://www.xtremepapers.me/CIE/index.ph ... 9_qp_1.pdf

 

[CaptainDanger]

Re: O'level Maths, Addmaths and Statistics help available he

xhizors The link you have posted is not working?

 

[adnanj]

Re: O'level Maths, Addmaths and Statistics help available he

9 different books r to be arranged on a book-shelf.4 of these books were written by Shakespeare, 2 by Dickens and 3 by Conrad.
How many possible permutations r there if
a) the books by conrad must be next to each other?
b) the books by dickens are separated from each other?
c) the books by conrad r separated from each other???


please help me in this question..

 

[abcde]

Re: O'level Maths, Addmaths and Statistics help available he

24. (a) 3! x 7! = 30, 240.
(b) Possible permutations if the books by Dickens are next to each other = 2! x 8! = 80, 640.
=> Possible permutations if the books by Dickens are separated from one another = 9! - 80, 640 = 282, 240.
(c) I am not getting the same answer as the back of the book here.
Since there are 3 books by Conrad, the possible permutations that they would all be together is = 3! x 7! = 30, 240.
Now 2 books of Conrad can also be next to each other = 2! x 8! = 80,640.
So the possible permutations if Conrad's books are separated = 9! - (80, 640 + 30, 240) = 252, 000.
This is what I think and I may be wrong.

 

[adnanj]

Re: O'level Maths, Addmaths and Statistics help available he

24. (a) 3! x 7! = 30, 240.
(b) Possible permutations if the books by Dickens are next to each other = 2! x 8! = 80, 640.
=> Possible permutations if the books by Dickens are separated from one another = 9! - 80, 640 = 282, 240.
(c) I am not getting the same answer as the back of the book here.
Since there are 3 books by Conrad, the possible permutations that they would all be together is = 3! x 7! = 30, 240.
Now 2 books of Conrad can also be next to each other = 2! x 8! = 80,640.
So the possible permutations if Conrad's books are separated = 9! - (80, 640 + 30, 240) = 252, 000.
This is what I think and I may be wrong.

thank u so much understood part A and B .. but what to do with C?? how to get the same answer as at the back of the book?

 

[abcde]

Re: O'level Maths, Addmaths and Statistics help available he

I think the answer at the back of the book is wrong. I battled with this question before my exams, too and this is the best I could come up with. I hope some one else can help here. Best of luck!

 

[adnanj]

Re: O'level Maths, Addmaths and Statistics help available he

I think the answer at the back of the book is wrong. I battled with this question before my exams, too and this is the best I could come up with. I hope some one else can help here. Best of luck!

can u elaborate part c??? (3!*7!) is ok with me..but ur second step., i didn't understand...

 

[iFuz]

Re: O'level Maths, Addmaths and Statistics help available he

i just posted answer to this in another thread in which u asked about it


h3y all..
for quickest revision of relative velocity chek this link

http://www.numberskill.com/lessons-publ ... ity-part4/

 

[iFuz]

Re: O'level Maths, Addmaths and Statistics help available he

for permutations: http://www.numberskill.com/lessons-publ ... ity-part4/

 

[abcde]

Re: O'level Maths, Addmaths and Statistics help available he

Ok. You have to find the possible permutations when ALL of Conrad's books are separated from one another. Since there are 3 books by him, there's a possibility that in some arrangements two of them are put together so that is why I also subtract (2! x 8!) from 9! .

 

[xhizors]

Re: O'level Maths, Addmaths and Statistics help available he

xhizors The link you have posted is not working?

http://www.xtremepapers.me/CIE/index.ph ... 9_qp_1.pdf

 

[tahatehseen]

Re: O'level Maths, Addmaths and Statistics help available he

xhizors The link you have posted is not working?

http://www.xtremepapers.me/CIE/index.ph ... 9_qp_1.pdf

This is how you do it!! Again, hope it helps!!

PS. save the image to ur desktop and then view it

 

[tahatehseen]

Re: O'level Maths, Addmaths and Statistics help available he

xhizors The link you have posted is not working?

http://www.xtremepapers.me/CIE/index.ph ... 9_qp_1.pdf

here is the graph

 

[adnanj]

Re: O'level Maths, Addmaths and Statistics help available he

http://www.xtremepapers.me/CIE/Cambridg ... _qp_12.pdf

Q8(ii) please...

 

[tahatehseen]

Re: O'level Maths, Addmaths and Statistics help available he

here is ur answer

 

[adnanj]

Re: O'level Maths, Addmaths and Statistics help available he

here is ur answer

thanks for help.. and now i want to help u the gradient is wrong its -0.5 and thus ur value of A is incorrect.. though method mark is secured by u