Mathematics: Post your doubts here!

[Fatma Gahman]

A student is chosen at random. The probability that the student estimates that the mass is greater than M grams is 0.3. Find the value of M.?? HELP PLZZ

 

[Zain Salman Dar]

how and why did you calculate the distance for modZ ... isn't it supposed to be from the (0,0) to the farthest point on the shaded region ?!

No. The distance if from the point on which the angle is created.

 

[Zain Salman Dar]

MATH HELP NEEDED...PLEASE HELP

How to solve this inequality question?
(3x+1)(x+1)>0

Truly its an easy question but i am confused that if we take (3x+1)>0 and (x+1)>0 then it shows answer wrong.... why is this so??????? please help

x>-1/3
x> -1

-1<x<-1/3

 

[Zain Salman Dar]

A student is chosen at random. The probability that the student estimates that the mass is greater than M grams is 0.3. Find the value of M.?? HELP PLZZ

Which paper? Any link?
This is not the complete question.

 

[Zain Salman Dar]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s13_ms_32.pdf Q9 (ii) how to find |Z|

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_ms_32.pdf Q8 (ii) how to find the least value of |z-w|



thanks in advance

Draw a line from the centre of circle with centre i to the edge of the circle with centre 1.
Calculate the distance

 

[Fatma Gahman]

Which paper? Any link?
This is not the complete question.

May june 2013 (41) question 3 b (ii)

 

[Haider Ejaz]

x>-1/3
x> -1

-1<x<-1/3

its not accurate answer.... its correct answer is x<-1 and x>-1/3.... i dont know how.

 

[Fatma Gahman]

May june 2013 (41) question 3 b (ii)

Reply back please :/

 

[SitiPutri]

its not accurate answer.... its correct answer is x<-1 and x>-1/3.... i dont know how.

 

[Zain Salman Dar]

its not accurate answer.... its correct answer is x<-1 and x>-1/3.... i dont know how.

place the values between the range given and values greater and less than the range. The answer will specify the given range i.e x<-1 and x>-1/3

 

[Zain Salman Dar]

A student is chosen at random. The probability that the student estimates that the mass is greater than M grams is 0.3. Find the value of M.?? HELP PLZZ

sorry,haven't done p4 yet

 

[Bumble_bee]

Assalamualikum and hello everyone.
I'm stuck in this question, so can anyone solve it for me?Would be of great help. Thanx.
The parametric equations of a curve are
x=2ɵ+cosɵ y=ɵ+sinɵ
where 0≤ɵ≤2π
1. Find dy/dx in terms of Ɵ.
2. Show that, at points on the curve where the gradient is 3/4, the parameter Ɵ satisfies an equation of the form
5sin(Ɵ+P)=2 , where the value of P is to be stated.
3. Solve the equation in part 2 to find the two possible values of Ɵ.

 

[Ch.Walid]

How can we find the range of g in part c.

Thanks in advance.




Bumble_bee Can u help me too.

 

[Haider Ejaz]

thank you.. now got it... thank you very much may God bless you

 

[Haider Ejaz]

please help me in doing this question... thanks in advance

 

[Bumble_bee]

please help me in doing this question... thanks in advance View attachment 50852

1) 2^x - 2^-x = 1 can be written as 2^x - 1/2^x = 1. And since y=2^x , the eqn can be written as y - 1/y = 1.
You can hence form the quad eqn y^2 - 1 = y (by multiplying both sides by y) which then rearranges to give y^2 - y -1=0.
2) You can solve the quad eqn involving y to give y= 1.618 and y= -0.618 (use quadratic formula to solve or the cal)
Now since y=2^x ,
1.618= 2^x. ln both sides to give ln 1.618 = x ln 2
x = ln 1.618/ ln 2 = 0.694 correct to 3 s.f .
y = -0.618 cannot be used to find a solution for x as ln negative values are undefined.

Hope you understood! You're welcome.

 

[Haider Ejaz]

1) 2^x - 2^-x = 1 can be written as 2^x - 1/2^x = 1. And since y=2^x , the eqn can be written as y - 1/y = 1.
You can hence form the quad eqn y^2 - 1 = y (by multiplying both sides by y) which then rearranges to give y^2 - y -1=0.
2) You can solve the quad eqn involving y to give y= 1.618 and y= -0.618 (use quadratic formula to solve or the cal)
Now since y=2^x ,
1.618= 2^x. ln both sides to give ln 1.618 = x ln 2
x = ln 1.618/ ln 2 = 0.694 correct to 3 s.f .
y = -0.618 cannot be used to find a solution for x as ln negative values are undefined.

Hope you understood! You're welcome.

Great and Superb... Now i have understood it completely... Thank you very very much and may God bless you.

 

[Haider Ejaz]

Thank you

 

[SitiPutri]

Assalamualikum and hello everyone.
I'm stuck in this question, so can anyone solve it for me?Would be of great help. Thanx.
The parametric equations of a curve are
x=2ɵ+cosɵ y=ɵ+sinɵ
where 0≤ɵ≤2π
1. Find dy/dx in terms of Ɵ.
2. Show that, at points on the curve where the gradient is 3/4, the parameter Ɵ satisfies an equation of the form
5sin(Ɵ+P)=2 , where the value of P is to be stated.
3. Solve the equation in part 2 to find the two possible values of Ɵ.

Answer attached.

 

[Abhay Ram]

Hi,
I am an A-Level Math student.
Can i get Math (P1,P3,M1,M2) chapter-wise past papers.
Thanks.

--Abhay