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#42051 Re: This is Cool » Mathematic complexity » 2005-07-08 18:15:28
The green, splendid paper plane flew slowly underneath the roof...
#42052 Re: This is Cool » Solve this! » 2005-07-08 18:09:47
Spiderman's contribution is 8 pounds.
Therefore, it is inferred each person contributes 8 pounds.
[keep em guessing, ganesh!]
#42053 Re: Guestbook » maths is great » 2005-07-07 22:34:49
Welcome to the forum, Sophie!
#42054 Re: Help Me ! » What is da Pythagoros theorem » 2005-07-07 22:29:46
My favorite book is
'The Man Who Loved Only numbers'
by Paul Hoffman
#42055 Re: Dark Discussions at Cafe Infinity » Terrorist Attack in London » 2005-07-07 22:22:22
Sad, very sad indeed! Why London????
#42056 Re: Help Me ! » Man, This is hard! Help me wif Algebra! » 2005-07-07 17:34:32
Algebra is a very useful tool in mathematics.
There are some basic rules you got to remember,
and if you do, you are good at it!
Like if you got to solve this problem,
knowledge of elementary algebra really helps!
Problem :- Ten years ago, my dad was four times my age.
Ten years later, he'd be double my age.
By how many years is he elder to me?
#42057 Re: Help Me ! » Tests » 2005-07-07 17:30:04
Just remember Polly,
knowing mathematics and sciences
is much more important
than scoring marks and grades!
#42058 Re: Help Me ! » Algebra » 2005-07-07 17:27:03
Its always difficult to find the factors, given the simplest form.
a^3 - b^3 is (a-b)(a^2 + ab + b^2).
If one of the factors is known, it becomes a bit easier.
For lower degrees, by remembering some formulae, it can be done easily.
Like a^2 - b^2 = (a+b) x (a-b),
(a^3 + b^3) = (a+b) x (a^2 - ab + b^2) etc.
When you are aksed to prove that the LHS is equal to the RHS,
it is always better to start with lower degrees.
#42059 Re: This is Cool » A weird idea » 2005-07-07 17:16:14
And I am 1152921504606846976
That is 1024 x 1024 x 1024 x 1024 x 1024 x 1024
#42060 Re: Puzzles and Games » Creeper » 2005-07-07 16:49:57
First, we'd have to convert the trunk into two dimensions.....
Now, we get a right angled triangle for one twist,
and one side of the triangle is 32 inches, height is 60 inches,
the hypotenuse is square root of
32^2 + 60^2
that is square root of
1024+3600,
eight times this value is the lenght of the creeper;
AND
Thank you, Mr.Administrator, for liking my avatar .
#42061 Re: Puzzles and Games » Try this one! » 2005-07-06 22:17:28
1, 3, 9, and 27 kg
1 kg can be directly weighed
3-1=2, (Which means putting 3kg on the left pan and 1kg on the right,
2kg of material can be got)
3 can be directly weighed,
3+1=4,
9-(3+1)=5,
9-3=6,
(9+1)-3=7,
9-1=8,
9 can be directly weighed,
9+1=10
and so on.
#42062 Jokes » Kids On The Internet » 2005-07-06 22:10:04
- Jai Ganesh
- Replies: 2
My kids love going to the Web, and they keep track of their passwords by writing them on Post-it notes.
I noticed their Disney password was "GoofyMickeyMinniePluto" and so I asked why it was so long.
"Because," my son explained, "they said it had to have at least four characters."
(2) A teacher asked one of her pupils, 'What's the nation's capital?'
The reply was, 'Washington DC'
On being asked what the 'DC' stood for, the pupil added, 'Dot com!'
(3) Working as a computer instructor for an adult-education program at a community college, I am keenly aware of the gap in computer knowledge between my younger and older students.
My observations were confirmed the day a new student walked into our library area and glanced at the encyclopedia volumes stacked on a bookshelf.
"What are all these books?" he asked.
Somewhat surprised, I replied that they were encyclopedias.
"Really?" he said. You mean that someone printed out the whole thing?" WOW!
#42063 Puzzles and Games » Creeper » 2005-07-06 18:48:42
- Jai Ganesh
- Replies: 9
A creeper plant is climbing up and around a cylindrical tree trunk in a helical manner. The tree trunk has a height of 480 inches and a circumference of 32 inches. If the creeper covers a vertical distance of 60 inches in one complete twist around the tree trunk, what is the total length of the creeper? 
#42064 Re: This is Cool » "A Maths Dictionary for Kids" » 2005-07-06 18:16:10
The Dictionary is, indeed, fantastic!
#42065 Re: Jokes » joke! » 2005-07-06 18:10:36
Think....Think........Think................
Happiness comes through doors you
didn't even know you left open.
Birthdays are good for you;
the more you have,
the longer you live.
Ever notice that the people who are late
are often much jollier
than the people who have to wait for them?
If shops are lowering prices every day,
how come nothing is free yet?
You may be only one person in the world,
but you may also be the world to one person.
Don't cry because it's over;
Smile because it happened.
#42066 Re: This is Cool » Olympics for London ! » 2005-07-06 17:25:54
That's great news for London and the UK.
#42067 Re: Help Me ! » I need your help » 2005-07-06 17:20:01
Take your time. I am in no hurry.
After you have done it, I'd have to work an hour a day
to add just one or two digits, since that would require checking for all numbers from 0 to 9.
Thank you once again, Administrator.
#42068 Re: Jokes » joke! » 2005-07-06 17:08:21
Let robbis babe have this one,
I shall change my avatar.
#42069 Jokes » Human Body and Numbers » 2005-07-05 22:58:36
- Jai Ganesh
- Replies: 5
1. Our heart beats around 100,000 times every day.
2. Our blood is on a 60,000-mile journey.
3. Our eyes can distinguish up to one million color surfaces and take in more information than the largest telescope known to man.
4. Our lungs inhale over two million liters of air every day, without even thinking. They are large enough to cover a tennis court.
5. Our hearing is so sensitive it can distinguish between hundreds of thousands of different sounds.
6. Our sense of touch is more refined than any device ever created.
7. Our brain is more complex than the most powerful computer and has over 100 billion nerve cells.
8. We give birth to 100 billion red cells every day.
9. When we touch something, we send a message to our brain at 124 mph.
10. We have over 600 muscles.
11. We exercise at least 30 muscles when we smile.
12. We are about 70 percent water.
13. We make one liter of saliva a day.
14. Our nose is our personal air-conditioning system: it warms cold air, cools hot air and filters impurities.
15. In one square inch of our hand we have nine feet of blood vessels, 600 pain sensors, 9000 nerve endings, 36 heat sensors and 75 pressure sensors.
#42070 Re: Jokes » joke! » 2005-07-05 21:52:10
Robbies,
You change your avatar or I change mine..
The choice is yours!
Do reply.
#42071 Re: Introductions » All Hail the Super Member!!! » 2005-07-05 21:14:37
Well done, Mr T; Keep up the good work!
#42072 Re: Help Me ! » What is da Pythagoros theorem » 2005-07-05 21:11:25
Yes, 2(n)+1 and 2(2n+1)+1 are both odd numbers!
#42073 Re: Help Me ! » What is da Pythagoros theorem » 2005-07-05 17:23:50
The three values of the sides of a right angled triangle are also called a Pythagorean Triple.
A Pythagorean triple is a set of three whole numbers , such that one number squared added to another number squared equals the third number squared. Euclid could prove that there are an infinite number of such Pythagorean triples.
Euclid's proof begins with the observation that the difference between successive square numbers is always an odd number.
4 - 1 = 3, 9 - 4 = 5, 16 - 9 = 7, 25 - 16 = 9, 36 - 25 = 11, 49 - 36 = 13 etc.
#42074 Dark Discussions at Cafe Infinity » Mathematical proof » 2005-07-05 16:46:49
- Jai Ganesh
- Replies: 8
Mathematicians are notorious for being sticklers when it comes to requiring absolute proof before accepting any statement. Their reputation is clearly expressed in a story told by Ian Stewart in 'Concepts of Modern Mathematics':-
An astronomer, a physicist, and a mathematician (it is said) were holidaying in Scotland. Glancing from a train window, they observed a black sheep in the middle of a field.
'How interesting' observed the astronomer, 'all Scottish sheep are black!' To which the
physicist responded, 'No, no! Some Scottish sheep are black!' The mathematician gazed heavenward in supplication, and then intoned, 'In Scotland there exists at least one field, containing at least one sheep, at least one side of which is black.'
Taken from 'Fermat's Last Theorem' by Simon Singh
#42075 Re: Help Me ! » Any Guesses????? » 2005-07-05 16:23:34
Mathsy is right! This is a puzzle and crept into 'Help me' by mistake.
Anyway, I shall give the solution.
One dice is marked 0,1,2,3,4,5.
The other is marked 0,1,2,7,8,9.
Don't ask me how you get 6!