Mathematics: Post your doubts here!

[DeadlYxDemon]

Please tell me how to solve this?
P22 O/N 2013

 

[Lavinge]

Hi guys, can you please tell me how to do number 18 http://freeexampapers.automaticpapers.com/igcse-o-level/mathematics-0580/0580_s13_qp_22.pdf

 

[Sohel d assassin]

it is ez from hereView attachment 40872

Thank u Umar Ahmed .. its truly help ful !! . bt i slvd it !! .. tmr i hav exam !! ..

 

[Sohel d assassin]

tomorrow frst exam !! . and dats maths !! . tensed !! :O .. hope it goes well !! .

 

[Mai(M4!)]

Recognise properties of triangles, quadrilaterals and
circles directly related to their symmetries.

Recognise symmetry properties of the prism
(including cylinder) and the pyramid (including
cone)

what r the properties???

 

[Mai(M4!)]

tomorrow frst exam !! . and dats maths !! . tensed !! :O .. hope it goes well !! .

me too AllAH will help us Inshaa Allah

 

[DeadlYxDemon]

Have I done It Right? If not, plz explain.....

Q17, P22- O/N 2013

 

[DeadlYxDemon]

HOW WILL THIS QUESTION BE SOLVED? I CAN"T UNDERSTAND IT?!

 

[Sohel d assassin]

me too AllAH will help us Inshaa Allah

tnkz @Mai(M4!) inshallah !! allah will help u also !! . best of luck !! ..

 

[NotYourType]

Hi guys, can you please tell me how to do number 18 http://freeexampapers.automaticpapers.com/igcse-o-level/mathematics-0580/0580_s13_qp_22.pdf

did u gt hw to do tht? i rmmbr doing it but seem to hve forgotten

 

[Sohel d assassin]

HOW WILL THIS QUESTION BE SOLVED? I CAN"T UNDERSTAND IT?!View attachment 41343

frst take out the upper bound of 8.5 wch 8.55 and lower bound wch is 8.45 and den calculate the area .. lik pie*r^2 of both the radius .. hope dis helps u !! all the best

 

[QatarOwnz]

someone explain this please
http://puu.sh/8AstZ

 

[Mai(M4!)]

someone explain this please
http://puu.sh/8AstZ

5x X 3x=15x
5x X -2=-10x

-6 X 3x=-18x
-6 X -2=12

15x-18x-10x+12= 12-13x

 

[NotYourType]

someone explain this please
http://puu.sh/8AstZ

5x(-6 X 3x)-6 X -2
5x-18x + 12
-13x + 12

 

[NotYourType]

b

5x X 3x=15x
5x X -2=-10x

-6 X 3x=-18x
-6 X -2=12

15x-18x-10x+12= 12-13x

ut isnt the -6 only for the numbers in the bracket?

 

[Mai(M4!)]

View attachment 41341
Have I done It Right? If not, plz explain.....

Q17, P22- O/N 2013

wrong
upper row,first column (2x5 + 1x1)=(11)
upper row,second column (2x0 + 1x5)=(5)
second row,first column (4x5 + 6x1)=(26)
second row,second column (4x0 + 6x5)=(30)
answer is 11 5
26 30

 

[Mai(M4!)]

b

ut isnt the -6 only for the numbers in the bracket?

yeah both are right I don't know why I always choose the longest way round

 

[Mai(M4!)]

Recognise properties of triangles, quadrilaterals and
circles directly related to their symmetries.

Recognise symmetry properties of the prism
(including cylinder) and the pyramid (including
cone)

what r the properties???

Anybody help please

 

[NotYourType]

yeah both are right I don't know why I always choose the longest way round

ahhkk wen i multiply the 6 with the -2 in bracket, do i do it as -6 x -2 or 6 x -2?

 

[Mai(M4!)]

ahhkk wen i multiply the 6 with the -2 in bracket, do i do it as -6 x -2 or 6 x -2?

the first one -6 x -2