Author Topic: IGCSE MATHS Doubts  (Read 130472 times)

Offline ksitna

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Re: IGCSE MATHS Doubts
« Reply #1080 on: May 18, 2010, 11:15:07 pm »
take whatever you want and give nothing back :)

Offline NidZ- Hero

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Re: IGCSE MATHS Doubts
« Reply #1081 on: May 18, 2010, 11:17:43 pm »
GOOD LUCK EVERYONE
JUST CHILL
AND HAVE FUN MATHS IS EASY (i shuld nt be de one sayin it ) ;D :) ;)

Offline Shazizzzle

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Re: IGCSE MATHS Doubts
« Reply #1082 on: May 18, 2010, 11:20:00 pm »
i neeed help with this
oct nov 06
8 b) iv)

Q8.

b) i) Bottles: Total money/money per bottle
                  60.30/0.45 (45 cents = 0.45 dollars)

ii) Since both are cents, simply write the equation.  x/45
iii) x-75/48

iv) Now, the number of bottles sold on tuesday were 7 more than on wednesday. Than means, wednesday lacked 7 to be equal to tuesday.
So in the eq, you give wednesday 7 more, to make it equal to tuesday. Then you put an equality and form an equation!
So  No. of bottles sold on tuesday = no. of bottles sold on wednesday + 7
          x/45  = x-75/48  +  7

48x - 15120 = 45x - 3375
x=3915
•$#@2™•

Offline ksitna

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Re: IGCSE MATHS Doubts
« Reply #1083 on: May 18, 2010, 11:22:04 pm »
Q8.

b) i) Bottles: Total money/money per bottle
                  60.30/0.45 (45 cents = 0.45 dollars)

ii) Since both are cents, simply write the equation.  x/45
iii) x-75/48

iv) Now, the number of bottles sold on tuesday were 7 more than on wednesday. Than means, wednesday lacked 7 to be equal to tuesday.
So in the eq, you give wednesday 7 more, to make it equal to tuesday. Then you put an equality and form an equation!
So  No. of bottles sold on tuesday = no. of bottles sold on wednesday + 7
          x/45  = x-75/48  +  7

48x - 15120 = 45x - 3375
x=3915


OHHH i thought we had to multiply by 7
oh thank you so much!
take whatever you want and give nothing back :)

Offline Vin

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Re: IGCSE MATHS Doubts
« Reply #1084 on: May 18, 2010, 11:25:01 pm »
i neeed help with this
oct nov 06
8 b) iv)

8 b) iv) easy !!

x/45 - 7 = x - 75/46

x-315/45 = x-75/48

interchange denominators

48 ( x - 315) = 45 ( x - 75)

48x - 15120 = 45x - 3375

3x = 11745

x=3915

comon wats wrong with u !!


..

Offline NidZ- Hero

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Re: IGCSE MATHS Doubts
« Reply #1085 on: May 18, 2010, 11:50:38 pm »
plzzzz can any1 help me wid o/n 2002 3c(iv) hw vil we noe dat R (-1,7)
« Last Edit: May 18, 2010, 11:52:36 pm by Nidzzz »

Offline thenewkid™

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Re: IGCSE MATHS Doubts
« Reply #1086 on: May 19, 2010, 04:45:05 am »
hv my p4 in 6 hrs
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Offline takamorinki

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Re: IGCSE MATHS Doubts
« Reply #1087 on: May 19, 2010, 04:50:20 am »
my paper is 4 hours from now ~

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Re: IGCSE MATHS Doubts
« Reply #1088 on: May 19, 2010, 05:09:49 am »
mine is 4 hrs as well
mns u ll be givin invarriant 2 n u live in uae :P :P
By the way total surface area of pipe will be=2<pie>r^2+2<pie>rh -2<pie>r^2
tooo complicated lol ;D

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Re: IGCSE MATHS Doubts
« Reply #1089 on: May 19, 2010, 05:12:08 am »
mine is 4 hrs as well
mns u ll be givin invarriant 2 n u live in uae :P :P
By the way total surface area of pipe will be=2<pie>r^2+2<pie>rh -2<pie>r^2
tooo complicated lol ;D
2 <Pie>r h is the formula for findin area of a hollow pipe!!!!
m i ryt
 ??? ???

Offline thenewkid™

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Re: IGCSE MATHS Doubts
« Reply #1090 on: May 19, 2010, 05:28:04 am »
2 <Pie>r h is the formula for findin area of a hollow pipe!!!!
m i ryt
 ??? ???
its the formula 4 finding the volume of a solid cylinder
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Offline thenewkid™

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Re: IGCSE MATHS Doubts
« Reply #1091 on: May 19, 2010, 05:29:08 am »
Quote
its the formula 4 finding the volume of a solid cylinder
i mean 2 pi r^h
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Offline thenewkid™

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Re: IGCSE MATHS Doubts
« Reply #1092 on: May 19, 2010, 05:29:53 am »
2 pi r h
sry
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Offline thenewkid™

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Re: IGCSE MATHS Doubts
« Reply #1093 on: May 19, 2010, 05:38:18 am »
Quote
my paper 4 is today as well! Sad just a few hours away
can anyone help me out with this question? i can't use trig to calculate this angle, probably just missing something really easy cuz of stress and lack of sleep: June 2005, Paper 4 question 2e

thanks a lotttt!
3 hrs left
make a straight line down C and u'll get 90 at the bottom then cont using trig
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Offline thenewkid™

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Re: IGCSE MATHS Doubts
« Reply #1094 on: May 19, 2010, 05:41:25 am »
Quote
also, do we have to know how to make scale drawings for our current syllabus? i've never practiced it before, ever...does anyone think that will come on the paper today?
there are chances but dont worry. just convert all the units to cm or mm or whatever then use the scale factor as a ratio eg;  1cm:20000000cm
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