Mathematics: Post your doubts here!

[Catherine7532]

Can anyone plzzzz help me with this question
Two rectangles have the same area of 480cm^2. The difference between their lengths is 10 cm and the difference between their widths is 4 cm. Calculate the dimensions of the rectangles.
The answer is 40x12 and 30x16cm
THANKS IN ADVANCE

 

[Suchal Riaz]

My answer of permutation and combination never comes true. i know everything. read book. solved most of the book. but when it comes to past papers i m not able to solve it. any notes, videos or assistance is highly appreciated.

 

[blackie39]

Does any one have notes for all the formulas that we need???

 

[Suchal Riaz]

suchat what book did u hhave ! because the book that i had had waaay harder questions than the papers ! and practice makes perfect !!

then please capture it's pages with a camera or phone and upload it. correct answers as well.. it will help me. I am having additional mathematics by Ho Soo Thong and Khor Nyak Hlong. In other chapters i m good as i study over internet mostly. especially relative velocity trigonometry and calculus are extremely easy for me.

 

[aaaamfa]

please ans the following question as soon as possible :

On the map of scale 1:20,000 the area of a forest is 50 cm square .On another map of area of the forest is 8 cm square .Find the scale of the second map.

 

[sweetiepie]

Does any one have notes for all the formulas that we need???

https://www.xtremepapers.com/community/threads/useful-stuff-compiled.10273/ all is here

 

[TehListener]

Could any1 send me a maths formulae booklet...

http://www.wiziq.com/tutorial/194798-IGCSE-MATHEMATICS-FORMULA-BOOKLET-BY-BAAZ-MOHD-HILMY
Visit here all the IGCSE Syllabus formulas are compiled into this file.

 

[Suchal Riaz]

suchat what book did u hhave ! because the book that i had had waaay harder questions than the papers ! and practice makes perfect !!

please help me out man

 

[mohamed almeeri]

find the 2 by 2 matrix that represent the transformation that maps a,b,c into a',b',c'? i want to know the steps??/

 

[Soudha Chaudry]

HEYYYY FRNDXXXX
Does any one have topic wise past papers according to the syllabus for MATHS (IGCSE)
PLEASE kindly post them here i am in an urgent need of them!!!!!!!!!!

Thank you in advance

 

[SilverCrest]

F

please ans the following question as soon as possible :

On the map of scale 1:20,000 the area of a forest is 50 cm square .On another map of area of the forest is 8 cm square .Find the scale of the second map.

First find the original area of the forest .
if 1 cm^2 represnts 20,000
then 50 cm^2 represents: 50*20,000 =100,0000 cm square

now on the other map 8 cm square represents the forest.write down the ratio ,then simplify:
8:100,0000
1:125000
And thats the answer.

 

[ZaqZainab]

F
First find the original area of the forest .
if 1 cm^2 represnts 20,000
then 50 cm^2 represents: 50*20,000 =100,0000 cm square

now on the other map 8 cm square represents the forest.write down the ratio ,then simplify:
8:100,0000
1:125000
And thats the answer.

But isn't it that 1cm=20000cm
and 1cm^2=400000000cm^2
I am Just Asking cause i also have a problem with Map Scales

 

[Mohammed Emad]

Hi, this might seem a little childish cuz of it's hw easy it is
But I've just tried all sorts of methods for it, just wont work(It might be just me not understanding the method(s) myself, which I thought are a peice of cake for me)
This question is from Myimaths.com and my teacher told me to use the cross multiplication method. I've been stuck on it for abt a week now.
Any help plz would be appreciated.

Here is the question:


Why isn't anyone helping me?

 

[Nita Mahajan]

hey do anyone of you have notes on logarithms??

 

[roudina]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s11_qp_42.pdf can u help plz i can't solve the last question in this paper ..... I solved it as linear equation but i got another answer other than the one in the mark scheme .....

 

[Mr.Ahmed]

You can use the simultaneous equations method :
Place 1 and 2 in the equation an^3+ bn^2+ n to get the total number of lines used in each diagram the answer is
1)8a +4b +2=12
2)a+b+1=3
Now you have two formulas !!
I've checked with marked scheme also

 

[aaaamfa]

F
First find the original area of the forest .
if 1 cm^2 represnts 20,000
then 50 cm^2 represents: 50*20,000 =100,0000 cm square

now on the other map 8 cm square represents the forest.write down the ratio ,then simplify:
8:100,0000
1:125000
And thats the answer.

thnkx a loooooooootttttttt may ALLAH help u in ur difficulties

 

[roudina]

You can use the simultaneous equations method :
Place 1 and 2 in the equation an^3+ bn^2+ n to get the total number of lines used in each diagram the answer is
1)8a +4b +2=12
2)a+b+1=3
Now you have two formulas !!
I've checked with marked scheme also

but they said the total number of lines for diagram 2 is 9 how did u make it 12??

 

[ZaqZainab]

but they said the total number of lines for diagram 2 is 9 how did u make it 12??

Exactly i also had the same doubt~

 

[ZaqZainab]

Any one help me with transformations! I don't know how to explain "The single Transformations??" Well i know if it is Reflection Translation or Whatever but i have a problem with the vector or to say it is x=y or some thing! Help plz