Math Is Fun Forum

  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#101 2017-01-19 04:37:22

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 746

Re: Logical question s

What I do in this question plz tell


Malik

Offline

#102 2017-01-19 04:39:25

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Logical question s

First, for the 3rd time, get the formula for the surface area of the sphere.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#103 2017-01-19 20:00:33

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 746

Re: Logical question s

The surface area of a sphere is:

A=4pi r^{2}.


Malik

Offline

#104 2017-01-19 20:11:49

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Logical question s

If surface area of sphere is 100pi cm^2 , it's radius will be
5
10
25
50

Since you know A = 100 pi you can substitute into that formula.

Do you know what to do now?


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#105 2017-01-20 03:39:48

Mathegocart
Member
Registered: 2012-04-29
Posts: 2,226

Re: Logical question s

Zeeshan, in the future, it would be preferable to try LaTeX or Codecogs so people can understand your statements.


The integral of hope is reality.
May bobbym have a wonderful time in the pearly gates of heaven.
He will be sorely missed.

Offline

#106 2017-01-20 04:08:38

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Logical question s

Well said, Latex is possible DK's greatest contribution to man.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#107 2017-01-20 20:58:56

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 746

Re: Logical question s

Haha I really know  the formula but write 2 by mistake

Mathegocart hehe I think you people good in english so I wrote fast but you count every single statement
Next time I wrote complete question ok


Malik

Offline

#108 2017-01-20 21:05:07

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 746

Re: Logical question s

Ans is 5


Malik

Offline

#109 2017-01-20 21:38:05

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Logical question s

r = 5 is correct.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#110 2017-01-21 04:59:18

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 746

Re: Logical question s

You know power series???


Malik

Offline

#111 2017-01-21 05:01:50

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Logical question s

Yes, I know lots of nice things about power series.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#112 2017-01-22 03:41:38

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 746

Re: Logical question s

Plz explain


Malik

Offline

#113 2017-01-22 03:45:52

zetafunc
Moderator
Registered: 2014-05-21
Posts: 2,432
Website

Re: Logical question s

What would you like to have explained?

Last edited by zetafunc (2017-01-22 03:46:08)

Offline

#114 2017-01-22 03:52:22

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Logical question s

Plz explain

A power series can be thought of as a polynomial of infinite degree. The field is huge so you will have to narrow the questiion down. In computation, we use them often.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#115 2017-01-25 04:30:54

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 746

Re: Logical question s

Means???.
computation, we use them often.


Malik

Offline

#116 2017-01-25 04:52:40

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Logical question s

Polynomials are something we know a lot about. They are easy to compute, they have nice derivatives and integrals, we can find the roots numerically, they are faster for computers. Transcendental functions like e^x are another matter.

For instance if we have x^2 - 2x + 1 and x = 1 anybody who has some algebra can tell us the 1^2 - 2(1) + 1 = 0.

But if I ask what is e^x when x = 1? It is not so easy. To get that we use power series ( among other methods ).


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#117 2017-01-27 15:22:33

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 746

Re: Logical question s

Hmm e^x at 1 is difficult to compute so which series used


Malik

Offline

#118 2017-01-27 16:01:48

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

Re: Logical question s

The power series for e^x of course.

Notice that e^x has been replaced by powers of x.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline

#119 2017-02-02 01:51:19

iamaditya
Member
From: Planet Mars
Registered: 2016-11-15
Posts: 821

Re: Logical question s

Hi here are all the answers.

Last edited by iamaditya (2017-02-06 23:31:17)


Practice makes a man perfect.
There is no substitute to hard work
All of us do not have equal talents but everybody has equal oppurtunities to build their talents.-APJ Abdul Kalam

Offline

#120 2017-02-17 01:17:20

Zeeshan 01
Member
Registered: 2016-07-22
Posts: 746

Re: Logical question s

Kk


Malik

Offline

Board footer

Powered by FluxBB