Author Topic: IGCSE MATHS Doubts  (Read 129750 times)

Offline thenewkid™

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Re: IGCSE MATHS Doubts
« Reply #900 on: May 18, 2010, 05:21:27 pm »
as they both are similar triangles, their respective sides are in proportion

y/y+2 = (2y-1)/(y+1)

simplify this equation to get

y^2 - 4y - 2 = 0
ooooooooooooo now i see. Thanks
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Offline djwaqar*

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Re: IGCSE MATHS Doubts
« Reply #901 on: May 18, 2010, 05:23:09 pm »
Question2.C may/june 2006 paper4
How to solve this question
i have been tryiing to solve it from the past 20 mints

Offline ksitna

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Re: IGCSE MATHS Doubts
« Reply #902 on: May 18, 2010, 05:24:15 pm »
i dont get how they did this

Factorise completely m^4n ? 16n^5.


help plz!
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Offline Ghost Of Highbury

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Re: IGCSE MATHS Doubts
« Reply #903 on: May 18, 2010, 05:25:12 pm »

help plz!

plz check the question before u post it...wat does the "?" mean...
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Offline NidZ- Hero

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Re: IGCSE MATHS Doubts
« Reply #904 on: May 18, 2010, 05:29:08 pm »
Question2.C may/june 2006 paper4
How to solve this question
i have been tryiing to solve it from the past 20 mints
hey same doubt here de last part is cofusin can any1 help wid this
thanku

Offline saleemsamer

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Re: IGCSE MATHS Doubts
« Reply #905 on: May 18, 2010, 05:29:43 pm »
can some1 plz explain jun 2007 p4 q 2f and 4 c-e  :)

Offline mdwael

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Re: IGCSE MATHS Doubts
« Reply #906 on: May 18, 2010, 05:34:29 pm »
They may sound a stupid question but to me its not. Its this question in summer 2000 paper 4 page 7 c(i) part it says "explain why the point (60,280) is on the curve?" this is the first time I face this kind of question, I was hoping someone could explain it to me
By the way the MS says its "end of interval is 60, 20+40+200" ??? ???

Please answer my question, before I start headbutting the walls >:( :P
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Offline thenewkid™

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Re: IGCSE MATHS Doubts
« Reply #907 on: May 18, 2010, 05:38:06 pm »
Quote
Question2.C may/june 2006 paper4
How to solve this question
i have been tryiing to solve it from the past 20 mints

for part c multiply the area of the cross-section by 40
as for the surface area calculate the area of each of its faces and add them together
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Offline Vin

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Re: IGCSE MATHS Doubts
« Reply #908 on: May 18, 2010, 05:38:16 pm »
um.. i still dont get it... can u elaborate a bit more. By the way the ans in the ms is 2 days 13 hours


sorry im on a real hurry doin french maths together !! im sorry if u see again the working is right .. so wat didnt u understand ??

When the pool is emptied, the water flows through a cylindrical pipe of radius 12.5 cm.
so the volume of pool is emptied i.e

volume of pool = 1512 m3 * 100 *100 *100
=1512000000 cm3

The water flows along this pipe at a rate of 14 centimetres per second.

so the area of pipe is pi * 12.52 =490.874 cm2
flows at 14cm/s   so volume per second  = 490.874 cm2 * 14cm/s  
=   6870 cm3

Calculate the time taken to empty the pool.
Give your answer in days and hours, correct to the nearest hour.

volume emptying
---------------            
rate of vol emptying

=1512000000 cm3
-----------------
    6870 cm3/sec

=ans / 60(min) * 60(hrs) *24

=2.5473 days
=2 days 13 hrs

Offline Ghost Of Highbury

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Re: IGCSE MATHS Doubts
« Reply #909 on: May 18, 2010, 05:41:42 pm »
hey same doubt here de last part is cofusin can any1 help wid this
thanku

look at diagram 2

the shape ABO has an area of = 90/360 * 144pi = 113

area of the horizontal rectangle = (12+10=22) * (18-12=6) = 132

area of the BOCG = 12*10 = 120

total = 365

365*40 = 14600cm^3
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Offline ksitna

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Re: IGCSE MATHS Doubts
« Reply #910 on: May 18, 2010, 05:41:57 pm »
plz check the question before u post it...wat does the "?" mean...



oh sorry
its minus
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Offline Vin

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Re: IGCSE MATHS Doubts
« Reply #911 on: May 18, 2010, 05:42:08 pm »
tht gives the area of "rectangle" BCAE ( u visualise it by 'removing' tht part from the fig. )   


Offline saleemsamer

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Re: IGCSE MATHS Doubts
« Reply #912 on: May 18, 2010, 05:42:31 pm »
can some1 plz explain jun 2007 p4 q 2f and 4 c-e
plz help ???
« Last Edit: May 18, 2010, 05:45:21 pm by saleemsamer »

Offline Ghost Of Highbury

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Re: IGCSE MATHS Doubts
« Reply #913 on: May 18, 2010, 05:44:00 pm »
@saleesameer - hold on..answering urs now..
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Offline saleemsamer

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Re: IGCSE MATHS Doubts
« Reply #914 on: May 18, 2010, 05:46:09 pm »
@saleesameer - hold on..answering urs now..
Thank You its just tht im abit stressed  :-[