Mathematics: Post your doubts here!

[I Believe]

what's the answer for 6 (i)?

 

[Thought blocker]

View attachment 61255
what's the answer for 6 (i)?

Differentiate both side, when u differentiate any terms containing ý', just multiply it with dy/dx.
Then simple algebra to make dy/dx the subject.

 

[The Godfather]

I got 85 ini As level.
I gave p3 today, expects 55/75 and expect 45 + in s2. Will i get overall A?

 

[Samir Bin Aamer]

how was P3 paper today was it difficult???....it was very hard in my opinion..reply plzz

 

[I Believe]

I'm using the right method as shown in the markscheme and I get the equations right, but somehow I can't get the correct answer. Why? I get the tensions as 6.43 and 4.82

 

[The Godfather]

I will get 40 in statistics and 55 in P3. will i get A? As score = 85 (b) 70%
Rizwan Javed Thought blocker

 

[Thought blocker]

I will get 40 in statistics and 55 in P3. will i get A? As score = 85 (b) 70%
Rizwan Javed Thought blocker

B.

 

[Moses Danso]

Hi, do you by any chance have topical past questions for Mechanics 2 [Paper 5].
Can't seem to find some anywhere.

 

[Aathif Shaffy]

How to solve the simultaneous equation and get the answer?
i get 0.6736 for r but marking scheme says 0.6 for r

 

[Thought blocker]

View attachment 61430
How to solve the simultaneous equation and get the answer?
i get 0.6736 for r but marking scheme says 0.6 for r

https://drive.google.com/open?id=0B3NebwGVUDjGMXg4TllYNkVrVWM

 

[Aathif Shaffy]

https://drive.google.com/open?id=0B3NebwGVUDjGMXg4TllYNkVrVWM

thanks!

 

[Aathif Shaffy]

Oct/Nov 2009 S1 P62 Q1 How to do this ??

 

[Thought blocker]

Oct/Nov 2009 S1 P62 Q1 How to do this ??
View attachment 61439

I guess first part is not your problem, right? Though, mean = middle value in box - and - whisker diagram. Thus mid value is 51!
for part ii)
We know upper quartile means 0.75 probablity and lower quartile means 0.45 probablity as 0.45 is notgiven in the table thus consider 0.75 probablity and therfore z = 0.674,
CALCULATION :
upper quartile = 63
mean = 51
z = 0.674


0.674 = 63 - 51 / sd
sd = 17.80

do check my answers, m not sure as did S1 a year back

 

[Aathif Shaffy]

I guess first part is not your problem, right? Though, mean = middle value in box - and - whisker diagram. Thus mid value is 51!
for part ii)
We know upper quartile means 0.75 probablity and lower quartile means 0.45 probablity as 0.45 is notgiven in the table thus consider 0.75 probablity and therfore z = 0.674,
CALCULATION :
upper quartile = 63
mean = 51
z = 0.674


0.674 = 63 - 51 / sd
sd = 17.80

do check my answers, m not sure as did S1 a year back

aha yeah part ii) your answer is the ms answer so its correct .thanks a lot!
btw why is lower quartile 0.45 ? it should be 0.25 ryt?

 

[Thought blocker]

aha yeah part ii) your answer is the ms answer so its correct .thanks a lot!
btw why is lower quartile 0.45 ? it should be 0.25 ryt?

Oh sorry, yes its 0.25. Silly me.

 

[Abdullahassan_99]

URGENT! Can someone please tell me how to find A?

 

[Thought blocker]

URGENT! Can someone please tell me how to find A?

ln y = -kx^2 + ln A
thus A = e^y- intercept

 

[Hussain Jerry.]

Did somebody has worked solution of alevel maths p3 pastpapers?

 

[Thought blocker]

Did somebody has worked solution of alevel maths p3 pastpapers?

Only few!
try 8mundo.com
and yes, try to do it on your own, if you have doubts post it here.

 

[Aathif Shaffy]

May/June 2007 p6 how to do this?