Mathematics: Post your doubts here!

[Maz]

i did try but i didn't get the right answer and that is a frequent question almost in all exams :s

You can solve it using log, but isn't really in our syllabus and it's a bit complex too.
I did like :-
log x/log 3 = 2 [since h^-1(x)=2]
x = 3^2
x = 9

I am sure there is another easier method, since it's just for 1 mark

 

[always-smile :)]

You can solve it using log, but isn't really in our syllabus and it's a bit complex too.
I did like :-
log x/log 3 = 2 [since h^-1(x)=2]
x = 3^2
x = 9

I am sure there is another easier method, since it's just for 1 mark

i didn't use the log methode ever so we need another way to solve it

 

[NIM]

Because The Question said ( Calculate The Amount Of Money She Has After 5 Years ) Not Only The Interest. So We Add 7500 To The interest we calculated to get the total amount of money she has at the end of the years

ok so when i see per year, i ignore it ??? why do we add 7500 at the end?

guys may be this site will help u.........
http://www.buzzle.com/articles/simple-interest-vs-compound-interest.html

 

[Lost_Life]

hey guys, how do you do question 4 c
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w11_qp_42.pdf

 

[Lost_Life]

hey guys, how do you do question 4 c
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w11_qp_42.pdf

INCREDIBLY FRUSTRATING!

 

[Just Smie :)]

hey guys, how do you do question 4 c
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w11_qp_42.pdf

i : 4*6 = 24
ii : Pie*2.5^2*1.8*24 And Subtract The Answer From 1080

 

[Maz]

hey guys, how do you do question 4 c
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w11_qp_42.pdf

c(i) I think you do this logically (it's just 1 mark).
Of 20 cm(breadth) you can make 4 and of 30cm(length) you can make 6.
Therefore, 4*6= 24.

(ii) Each biscuit's volume is 35.3
Total= 35.3*24= 848.2
Leftover = 1080 - 848.2 =232

 

[Lost_Life]

i : 4*6 = 24
ii : Pie*2.5^2*1.8*24 And Subtract The Answer From 1080

how did....why...why did you multiply 4*6?

 

[Lost_Life]

how did....why...why did you multiply 4*6?

ohhhhh......................................

 

[Just Smie :)]

ohhhhh......................................

L*W

 

[mutilated_grass]

Hey guys, I was doin the O-level papers and I came across a monster of a question in this http://www.xtremepapers.com/papers/...Calculator Version) (4024)/4024_w11_qp_22.pdf
It's question 3) a ii)

 

[mutilated_grass]

Hey guys, I was doin the O-level papers and I came across a monster of a question in this http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w11_qp_22.pdf
It's question 3) a ii)

Section A!

 

[GetSomeLife]

Hey guys, I was doin the O-level papers and I came across a monster of a question in this http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Mathematics D (Calculator Version) (4024)/4024_w11_qp_22.pdf
It's question 3) a ii)

One line of symmetry. That's all there is to it!

 

[mutilated_grass]

One line of symmetry. That's all there is to it!

3 a part 2! the 3 mark question after the line of symmetry one! R^2:r^2...

 

[GetSomeLife]

3 a part 2! the 3 mark question after the line of symmetry one! R^2:r^2...

Ok:

Let the radius of bigger circle be R

Area of bigger circle = pie.R^2 = 10(area of small circles)

Why 10? There are five circles. PLUS there are 5 areas same as the shaded area and THIS area is equal to the circle's! (as mentioned in the qp)

5 circles + 5 shaded areas
5 Circles + 5 Circles
10 Circles

10(Pie.r^2) : Pie.R^2
Cancel Pie
10r^2 : R^2

They asked us the ration of R^2:r^2
so:
1 : 10

 

[mutilated_grass]

Ok:

Let the radius of bigger circle be R

Area of bigger circle = pie.R^2 = 10(area of small circles)

Why 10? There are five circles. PLUS there are 5 areas same as the shaded area and THIS area is equal to the circle's! (as mentioned in the qp)

5 circles + 5 shaded areas
5 Circles + 5 Circles
10 Circles

10(Pie.r^2) : Pie.R^2
Cancel Pie
10r^2 : R^2

They asked us the ration of R^2:r^2
so:
1 : 10

Thanks a lot! I didn't get the whole 10 circle connection initially

 

[GetSomeLife]

Thanks a lot! I didn't get the whole 10 circle connection initially

No problem

 

[Lost_Life]

hey guys how do we solve iv ON 2011 ISNT IT 1-(ONE OF THE X'ES)?

 

[anooshraja]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s11_qp_42.pdf
question 1 part b
question3 part b
question7 part a
plz reply me im posting bt everyone ignorning my post plz for sake of ALLAH REPLY

 

[anooshraja]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s11_qp_41.pdf
QUESTION 6 PART B PLZ REPLY FOR SAKE OF ALLAH