Mathematics: Post your doubts here!

[sj0007]

In part (ii) u have done a mistake.
2(4)^1.5 = 16 not 8

Oopsy ........then the answer would be 7/3?

 

[psychiatrist]

Oopsy ........then the answer would be 7/3?

Yeah.

 

[psychiatrist]

Ummmm..............can anyone help me with moi doubt: (The paper is w07 qp 4)

View attachment 57119

The marking scheme says that s1 + s2 = 10, I dont get that................. I came to the conclusion that it would be s1 - s2 = 10................ so can anyone explain why it is like that?

https://in.answers.yahoo.com/question/index?qid=20080719113741AApc5Qw

 

[sj0007]

Yeah.

 

[sj0007]

https://in.answers.yahoo.com/question/index?qid=20080719113741AApc5Qw

Ohhhh......THANKS ALOTTTT!!!!!!!!!!

 

[zahra azam]

Oopsy ........then the answer would be 7/3?

Yes thats ryt
Thanks a lot sis
For first step u did integration ryt?

 

[sj0007]

Yes thats ryt
Thanks a lot sis
For first step u did integration ryt?

Yup........ ⌒.⌒
Glad I could help.........

 

[musiclover gurl]

Help please?
(9709/32)

 

[Wolfgangs]

Can someone give me the solution for the second part of this question? The answer is 16km.

 

[Shujaat Khan]

Can someone give me the solution for the second part of this question? The answer is 16km.

Did you round off or some stuff? Cause I'm getting an answer close to it (15.7km). Btw I do not believe we get this in cambridge examinations( especially because neither integration/differenciation nor applying motion equations is to be required)

Edit: What i did was, displacement of bird=displacement of car 1.
Displacement= 16*40/41=15.6km
40/41 is the time taken for car1 to meet car2.

 

[musiclover gurl]

year??

Sorry I couldnt reply earlier...had internet connection problems....But the year is Nov 2014 p 32.

 

[musiclover gurl]

Help please?


Nov 2014 P 32

 

[Rizwan Javed]

Help please?
View attachment 57134

Nov 2014 P 32

This is the solution for the question. Hope it helps.

 

[musiclover gurl]

This is the solution for the question. Hope it helps.

Thank you so much Rizwan Javed ! I never knew I could transform the whole expression, ln 2/a + 1, into a power to exp. Thanks

 

[Rizwan Javed]

Thank you so much Rizwan Javed ! I never knew I could transform the whole expression, ln 2/a + 1, into a power to exp. Thanks

No problem!

 

[musiclover gurl]

Help please?
Nov 14 P 9709/32

 

[Shujaat Khan]

Help please?
Nov 14 P 9709/32
View attachment 57148

You should use the marking scheme for answers. Youshould then post what you did not understand from it then I can explain

 

[uzamaki]

3. The random variable X is normally distributed with mean µ and variance 21.0. Given that P(X > 10.0) = 0.7389,(w06_6) find the value of µ.please help me out with this problem anyone! aren't we supposed to use (X-mean)/sd but the answer came wrong!

 

[musiclover gurl]

You should use the marking scheme for answers. Youshould then post what you did not understand from it then I can explain

Well then, I cant even do the first part! Help?

 

[Shujaat Khan]

Well then, I cant even do the first part! Help?

It's hard to copy paste pheta everytime, I'm using pheta=@ ok?
sin (2@+@)= sin2@cos@+ cos2@sin@ -------1
This you get in formula sheet.

Then what is sin2@ and cos2@?
sin 2@= 2sin@cos@
cos 2@= 1-2sin^2 @

Replace in first equation
2sin@cos@cos@ +(1-2sin^2 @)sin@
2sin@cos^2 @+(1-2sin^2 @)sin@
----------->cos^2 @= 1-sin^2 @
2sin@(1-sin^2 @)+ (1-2sin^2 @) sin@
2sin@-2sin^3 @+ sin@ -2sin^3 @
=3sin@ -4sin^3 @
Easy? It's all in the formula sheet you are given, you just have to substitute.

For part 2, Relatively easy you just replace x by what is given and simplify.

For part 3, solve sin 3@= 3/4
you get valueS of @ and replace in x= 2sin@/3^0.5