Mathematics: Post your doubts here!

[angelcharms]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

Thanks Math_angel!

 

[alay]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

ok.thank u!

 

[mimmi]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

how much do i need to score to get an A?

is it 75/100 or 80/100?

 

[msd]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

Excuse e mooaa. Exams passioa aa way, follow my patternia of stoody.

 

[msd]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

Follow my pattern of study and u will top. By the way my pattern of study is, "THE CHEMICAL REACTIONS TAKING PLACE IN MY NUEROLOGICAL CELLS ARE ACTIVE AT SPEED OF LIGHT 3X10^8, LEADING TO PRECISE OUTCOMe"
Hope u got the relations between sci, and maths, hope u all do well as i am doing. I wiill get more than "A* grade"

 

[alay]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

could u pls explain no.11.b.) of http://www.xtremepapers.net/CIE/Cambrid ... _qp_21.pdf

 

[XPFMember]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

do u need all the three parts or only the first???
Anyways fot the first part....u can premultiply the coordinates...or if u notice this ;is reflection on y= -x
and if u know for this we interchange the coordinates and change the signs for noth x and y coordinates!!
Anyways...........the answer is (-q , -p)

 

[XPFMember]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

if u want the other parts too..let me know

 

[alay]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

thanks.but my problem is the third part of the question..it took me really long to find the solution.i saw that its only worth 1 mark so could u pls teach me a shorter method?

 

[XPFMember]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

Can u plz tell me what answers u got for L and M?????

 

[alay]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

L= (-q,-p)
M= (p,-q)

 

[XPFMember]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

ok so see what is actually happening when L has been transformed to M....coordinates have beeen interchanged and there's a change in the sign of x coordinate...so (1 0 will change to ( 0 -1
0 1) 1 0)

if u have any problems let me know...u may also refer to figures i gave earlier in the thread

 

[Scar]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

umm, i got a question i need fast help with..for paper 4...thats on 2morrow (
sometimes a question asks u find the 2x2 matrix which represents a transformation..(for ex: rotation around (0,0) 90 clockwise, or reflection in the line y=x)
do we need to come up with the matrix using substiution and simultaneous equations, or do we need 2 memorize all the transformations' matrices?
please answer me fast if u can, thanks in advance.

 

[XPFMember]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

Actually u can memorize but if they r asking u to find then u have to find it by tjis eqn. => I = MO ...i dont exactly remember u check it....taking inverse andd all that...check the eqn i doubt i have done a mistake

 

[jazzangel16]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

Guess what!! It took me 45 mins to figure out the Sequence question!!!! But luckily it was correct

Thankssssss ))))

 

[XPFMember]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

COngrats then!!

 

[angelcharms]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

Congratzz Everyone! We're done with MATHS!!

Cheers!! XD!!

 

[XPFMember]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

Anyone giving maths in june 2011???

 

[PeterG]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

Can anyone help me with a question that was on my zone's Paper 4?

It said: Two boats are mathematically similar. A real boat is 32 times bigger than the model boat. The tank of the small boat can hold 0.02 litres. How many litres can the real boat hold?

I didn't know how to do proportion for litres, but I assumed it was volume and cubed the scale factor, which was 32. I then multiplied it by 0.02 and got 655.36. Anyone?

 

[XPFMember]

Re: IGCSE Maths Tips nov.2010!Confused!have questions?Post h

Yes @PeterG ...ur answer is correct!!