Mathematics: Post your doubts here!

[yuliana95]

Ok my exam is in 2 hours. There is this question i dont get. I dont get question 9 (i) part only.

http://www.xtremepapers.com/CIE/Interna ... _qp_11.pdf

They got 10cm for one of the lengths. WTH? How do they get that?

Since P is the center of C1 and Q is the center of C2, so PT=8cm and TQ=2cm.. Hence, PQ=8+2=10cm

 

[mrpaudel]

Thx man, I also did the same, but why still cant get the answer? Is it my calculator's problem

i think u put it in degree mode...!! so thats happening..!! yeah....calculators problem

 

[Gémeaux]

plz cud anyone solve this
If the co-efficient of x^2 in expansion of (1+ ax + 3x^2)(1/2 - 2x)^5 is 13/2, then find the coefficient of x^3.

 

[abcde]

plz cud anyone solve this
If the co-efficient of x^2 in expansion of (1+ ax + 3x^2)(1/2 - 2x)^5 is 13/2, then find the coefficient of x^3.

AoA!
Is the answer -265/8 ?

 

[mrpaudel]

plz cud anyone solve this
If the co-efficient of x^2 in expansion of (1+ ax + 3x^2)(1/2 - 2x)^5 is 13/2, then find the coefficient of x^3.

xpand (1/2 - 2x)^5...there's a formula...!! but i forgot it...look at the formula and..xpand upto x^2...and then multiply with (1+ax+3x^2) and...
u will get
some of the terms of x^3....as in _x^3....and other _x^3 now..add those coefficient of X^3 and equate it to zero to get the value of a

 

[smartangel]

Can some one please explain how do we get the upper and lower quartiles in November 09 paper 6 Q4(ii)?

 

[smartangel]

also:
5 (a) Find how many numbers between 5000 and 6000 can be formed from the digits 1, 2, 3, 4, 5 and 6
(i) if no digits are repeated, [2]
(ii) if repeated digits are allowed. [2]

(b) Find the number of ways of choosing a school team of 5 pupils from 6 boys and 8 girls
(i) if there are more girls than boys in the team, [4]
(ii) if three of the boys are cousins and are either all in the team or all not in the team. [3]

 

[smartangel]

4 (a) (i) Find how many different four-digit numbers can be made using only the digits 1, 3, 5 and 6
with no digit being repeated. [1]
(ii) Find how many different odd numbers greater than 500 can be made using some or all of
the digits 1, 3, 5 and 6 with no digit being repeated. [4]
(b) Six cards numbered 1, 2, 3, 4, 5, 6 are arranged randomly in a line. Find the probability that the
cards numbered 4 and 5 are not next to each other.

please explain this one too. sorry im really bad with permutations and combinations.

 

[Scafalon40]

Please solve this, what do i do with the cos^2 in part (b)
Q5
http://www.xtremepapers.com/CIE/Interna ... _qp_11.pdf
paper 11 in 2010 exam

 

[yuliana95]

Please solve this, what do i do with the cos^2 in part (b)
Q5
http://www.xtremepapers.com/CIE/Interna ... _qp_11.pdf
paper 11 in 2010 exam

Change the sin^2 x in the form of cos^2 x and substitute in b..

 

[abcde]

How can question 3 (ii) be solved?

 

[yuliana95]

How can question 3 (ii) be solved?

Find the integration of the function

 

[rz123]

Help ! A sledge accelerates down a hill with a gradient of 28%(that is, at an angle of sin^-1 0.28 to the horizontal). At the foot of the hill the ground flattens out horizontally, and the sledge comes to rest in 40m after 10s. Find the speed of the sledge at the bottom of the hill, and the value of the coefficient of friction. Assuming that the coefficient of friction is the same throughout the ride, find the acceleration down the hill, and how far up the hill sledge was to begin with.

Answer: 8m/s, 0.08 (coefficient of friction),2.03(acceleration), 15.7m

 

[abcde]

How can question 3 (ii) be solved?

Find the integration of the function

This can be found in the mark scheme. Why is the area under the curve multiplied by pi? :Search:

 

[XPFMember]

assalamoalaikum..

cuz u are to find the volume...to find the volume...u got to square the eqn of the curve given..then integrate and then multiply by pi!

for finding area u just integrate the given eqn!

 

[yuliana95]

How can question 3 (ii) be solved?

Find the integration of the function

This can be found in the mark scheme. Why is the area under the curve multiplied by pi? :Search:

You are not asked to find the area, but the volume. so you should square the function and then the formula includes pi..

 

[babycry]

Can anyone please be kind enough to send me a PDF with notes explaining AS trigonometry.. i especially need help in the graph part, e.g find the range for 1-2tan(x/2)

thank you !!

 

[yuliana95]

Can anyone please be kind enough to send me a PDF with notes explaining AS trigonometry.. i especially need help in the graph part, e.g find the range for 1-2tan(x/2)

thank you !!

Try these links:

http://www.mathsrevision.net/alevel/pure/
http://www.revision-notes.co.uk/A_Level ... index.html
http://www.s-cool.co.uk/a-level/maths/t ... -functions
www.examsolutions.co.uk

 

[tanmaydube]

Find the first three terms in the expansion, in ascending power of x, of (2+5x)^12. By substituting a sutible value for x, find an approximation to 2.005^12 to 2 decimal places. (Ans: 4220.57)

Thank you for helping.

 

[yuliana95]

Find the first three terms in the expansion, in ascending power of x, of (2+5x)^12. By substituting a sutible value for x, find an approximation to 2.005^12 to 2 decimal places. (Ans: 4220.57)

Thank you for helping.

This is the best I can write on paint.. Sorry for the poor writing..