Mathematics: Post your doubts here!

[Fayax555]

Yeah okay first thing there was a hemisphere picture and it said that the vol of the hemisphere is about 243(Pi) and it said that the Surface area is K and it gave the sphere surface area to be 4(ppi)r^2 and the vol to be 4/3(pi)r^3 so I didnt divide the surface area by two cause I thought the surface area of the hemisphere is 3(pi)r^2 and not 2(pi)r^2 so i dont know which one is right to use

Can you answer that question with all the steps. Including how you found the radius.

 

[Misbah Sumar]

The math paper 22 was SUPERR easy, hope 42 is as easy as the first one

 

[snailey]

The math paper 22 was SUPERR easy, hope 42 is as easy as the first one

yeah really hoping that
However, ppl are saying that if paper 2 was esy paper 4 will be tough

 

[Fayax555]

yeah really hoping that
However, ppl are saying that if paper 2 was esy paper 4 will be tough

yeah, it may be true.

 

[snailey]

All the best to all the ppl appearing for tomorrows math

 

[suri003]

All the best to all the ppl appearing for tomorrows math

ty bt btw d paper wnt be tough nt necccisarly ... coz even till nw many papers were tooooo easy

 

[snailey]

Guys.. If function f(x)=2^x how to find out f^-1(x)=1.7

 

[Fayax555]

Guys.. If function f(x)=2^x how to find out f^-1(x)=1.7

link ??

 

[snailey]

link ??

Hah. I got the answer! I did it on my own
Thank you n sorry

 

[suri003]

ho

Hah. I got the answer! I did it on my own
Thank you n sorry

how did u do it ???????????????????????????????????????????????????????????????????????????????????????????

 

[snailey]

ho
how did u do it ???????????????????????????????????????????????????????????????????????????????????????????

The real method is by using log but thats not in the syllabus so just substitute x by 1.7 n u get the answer as 3.2 which is right. There is some long logic behind y we do that but its not required coz the same method is followed always.

 

[suri003]

y

The real method is by using log but thats not in the syllabus so just substitute x by 1.7 n u get the answer as 3.2 which is right. There is some long logic behind y we do that but its not required coz the same method is followed always.

eah dad said tat log vala thingi .............. ty anyways n gooodluck

 

[Fayax555]

The real method is by using log but thats not in the syllabus so just substitute x by 1.7 n u get the answer as 3.2 which is right. There is some long logic behind y we do that but its not required coz the same method is followed always.

You're right. Using log will be much easier to find power, although it is not in IGCSE syllabus.
Actually your question seems to be easy.

 

[snailey]

You're right. Using log will be much easier to find power, although it is not in IGCSE syllabus.
Actually your question seems to be easy.

Yeah.. I know i realised its easy after I wrote the question here.

 

[snipex]

Please help.
Th train question in p2, how much time did it take yo pass the bridge!

 

[snailey]

How was the paper finally? Was pretty easy, right?

 

[suri003]

yup

 

[Raj12345]

Hey guys I gave my paper 4 exam variant 42 a few days ago. I have made a huge mistake in my paper. instead of multiplying the probabilities i have added them. so can i get E.C.F (error carried forward) in the question. The whole question was of 15 marks. I am extremely sad. I got a bit confused between the mutually exclusive and independent events.

 

[***amd***]

Hey guys I gave my paper 4 exam variant 42 a few days ago. I have made a huge mistake in my paper. instead of multiplying the probabilities i have added them. so can i get E.C.F (error carried forward) in the question. The whole question was of 15 marks. I am extremely sad. I got a bit confused between the mutually exclusive and independent events.

I guesss yes ECF is possible... but it depends on the question itself too.

 

[snailey]

Hey guys I gave my paper 4 exam variant 42 a few days ago. I have made a huge mistake in my paper. instead of multiplying the probabilities i have added them. so can i get E.C.F (error carried forward) in the question. The whole question was of 15 marks. I am extremely sad. I got a bit confused between the mutually exclusive and independent events.

I dont think you will get EFC in this question because I myself gave the exam and I dont think the question allows this.