Mathematics: Post your doubts here!

[RGBM211]

I have also told you the answer to part (iii). Read what I said again. In part (ii), you're finding the displacement but in part (iii) you need to find the total distance.

thank you

 

[aliya_zad]

http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9709%20-%20Mathematics/9709_w09_qp_32.pdf

Can anyone please help me solve 2i)

 

[aliya_zad]

Is that formula like a set formula for vector problems!!
If possible can u show how uve substituted them!!
LIke (a-2) x 2 ...im so confused..
please explain in detail!!

 

[tbug13]

Hi can someone please help me with http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_s08_qp_4.pdf question 6 part iii. and explain why the answer is what it is? :S Thanks!

 

[Hussnain]

http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_w03_qp_4.pdf
Q7 (iv)
Please solve this me for me asap. Thanks

 

[kagome]

M/J 2006 P3 Q 10(ii) link
Can someone explain in details please? If possible please include illustration diagram in ur explaination.
Thx so much.

 

[junaidaftab]

Solve the following question:

10 The number of birds of a certain species in a forested region is recorded over several years. At time
t years, the number of birds is N, where N is treated as a continuous variable. The variation in the
number of birds is modelled by
dN
dt
=
N(1800 − N)
3600
.
It is given that N = 300 when t = 0.
(i) Find an expression for N in terms of t. [9]

I can't seem to decompose the fraction into its partial fractions correctly.

Anyone? ​

 

[2pac]

No, the points can be negative, e.g if you had arg(z+3i)=x rad, then you had to use (0,-3). . .

I didn't understand could you tell me a related example from the past papers?

 

[anonymous123]

9709 w07 qp 4
Q3 part ii
how do u find the ans directly? cant understand the concept behind it

 

[eyamwir]

hello can anyone help me with june 2008 qs 1.

|x-2| > 3|(2x + 1)| i can't seem to get the answer right.

 

[bamteck]

I have also told you the answer to part (iii). Read what I said again. In part (ii), you're finding the displacement but in part (iii) you need to find the total distance.

Please help me with the following AP questions :
1. Find the sum of all integers from 1 to 200 that are divisible by 7.
2. Find the sum of all integers from 1 to 200 inclusive that are not multiples of 5.
3. Find the sum of all multiples of 5 between 100 and 300 inclusive.
4. In a arithmetic progression of 25 terms, the 10th term is 23 and that the sum of the last 10 terms is 440. find the sum of the first 10 terms.

Thank You

 

[reina81]

MJ06 P3 Q2 i know how to solve it, but i just don't get how we decide on the value of x to be taken in the end. Can someone help me ASAP.
http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_s06_qp_3.pdf

http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_s06_ms_3.pdf​

 

[kagome]

MJ06 P3 Q2 i know how to solve it, but i just don't get how we decide on the value of x to be taken in the end. Can someone help me ASAP.​

http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_s06_qp_3.pdf​

​

http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_s06_ms_3.pdf​

bcoz the right hand result will always be postive. So if value x < -1 is substituted, it will not satify the equation given.
For ex, x = -2
-4 > │-3│
│-3│ is considered as 3. So its not acceptable

 

[kagome]

Can anyone explain me O/N 2005 P3 Q7(iii) please? I have no idea at all in dealing with this question.
Help needed....

 

[reina81]

bcoz the right hand result will always be postive. So if value x < -1 is substituted, it will not satify the equation given.
For ex, x = -2
-4 > │-3│
│-3│ is considered as 3. So its not acceptable

So do we always subsitute values to decide on which x to take? Because I've asked so many people and everyone's given me different methods that don't work for all the questions. so i really need a method that works with everything

 

[hm12]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s10_qp_41.pdf
In question 5 i do get that there is a gain in PE as height is increasing but how do we know that that there is a loss in KE???

 

[anonymous123]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_41.pdf
In question 5 i do get that there is a gain in PE as height is increasing but how do we know that that there is a loss in KE???

conservation of energy search google and try my question plz scroll up..

 

[kagome]

So do we always subsitute values to decide on which x to take? Because I've asked so many people and everyone's given me different methods that don't work for all the questions. so i really need a method that works with everything

On the safer side, just substitute ur answer to the given question to verify ur answer. I use this method...

 

[ousamah112]

http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_w07_qp_4.pdf
q6 last part.. plz someone upload a sketch.

 

[reina81]

On the safer side, just substitute ur answer to the given question to verify ur answer. I use this method...

oh ok thanks