Melody

921 Questions
34315 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
read more ..

Melody Apr 2, 2022

-8

609

1

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Reporting problems.

There are a number of people having problems at the moment.
If you lodge an error can you please give all relevant information that you can think of.
Where you are in the world - the city or the country - is often very important information. read more ..

Melody Mar 16, 2022

-2

8

1459

5

+118725

How to make an empty rectangle in Latex

I just worked out how to make an empty box of various horizonal size easily in LaTex.
This is not a recommended method, but other methods that I have tried here have not worked.
This coding is really simple. Just put letters inside read more ..

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Melody Mar 15, 2022

-3

871

3

+118725

HAPPY ANNIVERSARY CHRIS! (CPhill)

I just realized that you became a member here exactly 8 years ago today!

It has been great to have you here all that time

off-topic

Melody Mar 13, 2022

-4

849

3

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WELCOME BACK CPHILL !

Melody Feb 11, 2022

-5

717

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Very interesting question. No high level maths required.

This question was posted a couple of days ago.
https://web2.0calc.com/questions/geometry_73561

I think it is really interesting. It looks much more difficult than it really needs to be. read more ..

Melody Feb 1, 2022

-7

889

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Members have a better experience. Their questions get more attention.

Almost everyone is posting as a guest.
If you post as a member your questions will have a far greater chance of a timely and helpful response.
If you are a genuine learner and interact with us, you will become known and answerers will do read more ..

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Melody Jan 9, 2022

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1

996

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HAPPY BIRTHDAY CHRIS!

Melody Dec 20, 2021

+5

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+118725

Some guidelines for question askers.

Please note:
1) Ask only one question per post.
2) When asking a question talk about what you have tried for yourself. Then people will take you more seriously and will be more able and willing to help.
3) If you get an answer read more ..

off-topic

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Melody Nov 4, 2021

-9

1091

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Remeniscing - a little historical humour.

I just found this old post that some of you, who have been around for a while, might find amusing.

https://web2.0calc.com/questions/look-at-the-new-leader-board

off-topic

Melody Oct 29, 2021

+118725

0

lexidawn:
:oops: what do i do if i have two numbers on both sides of the equal sign?

do you mean something like

10=8 ?

there is no answer, 10 will never equal 8

MelodyMar 4, 2014

+118725

0

Hi,

History from Egypt ?

Do you have a question?

هل لديك سؤال؟

MelodyMar 4, 2014

+118725

0

PreciousAngel151:
1.5*10^25/6.02*10^23

Which is broken? Your finger or your calculator.
There is a calculator on this site that you can use.

MelodyMar 4, 2014

+118725

0

puzzledmaths:
what are 2 different solutions to this

-3-(_/_)=5

worded:
minus 3 minus open bracket an unknown number divided by an unknown number closed bracket equals 5

Add 3 to both sides

-(_/_) = 8

mult both sides by -1

( _/_) = -8

Does that make it easier? There are an infinite number of solutions. You can probably find 2 all by yourself.

Remember, a neg/pos = neg and pos/neg=neg SO exactly one of the numbers will have to be negative.

MelodyMar 4, 2014

+118725

+11

Hard one (I'm curious to see whether anyone can find a different strategy than I found.) :

Steve again wants to play a game with you but you need $2 for each time you want to play.
Now, each time you play the game, Steve has the computer print 100 blank cards with 100 random different integers.
After that you can flip the cards for as long as you like until you choose to stop flipping. If your last card flipped is the highest card in the deck you will win $10.

Think of a strategy where you expect to win money in this game.
Hint: The cards you previously flipped can give you some kind of information.
-----------------------------------------------------------------------------------------------------------------------------------------------------------
Alright then. I am assuming that I can only go through the 100 cards once.
I'll split the deck into 2deck of 50 cards each.
I'll go through the first 50 cards and note the highest integer.
Then I will stop at the 1st integer higher than this one in the second 50 cards.
If there are non higher then, I would have lost already.

The chance of success is not particularly high but it is better than no strategy at all.
Have you got a better idea reinout-g?

MelodyMar 4, 2014

+118725

+5

reinout-g:
New puzzle!
Three rivalling trainers (Pierre, Pieter and Peter) and their three athletes (Édouard, Eduard and Edward) want to cross a river.
There is only one boat which can carry two persons.
The trainers do not want other coaches to sit with their athlete.
How can they cross the river?

Firstly, i can't handle all those Ps and Es
Mine are going to be Cs and As

We have
C1, A1, C2, A2, C3, A3 to get across the river
first C1 and A1 paddle across the river C1 stays

A1, C2, A2, C3, A3
Now C2 and A2 paddle across the river C1 and C2 stay

A1, A2, C3, A3
Now C3 and A3 paddle across the river C1, C2 and C3 stay

A1, A2, A3
Now A1 and A2 paddle across the river C1, C2, C3, A1 stay

A2, A3
Now A2 and A3 paddle acrosst the river and they are all safely on the other side.

MelodyMar 4, 2014

+118725

0

reinout-g:
Melody:
*
Would like to comment on, or add to anything that I have said regarding communication with Andrew Massow.
If so, this would be an appropriate place to have your say.

Melody.

Yeah! My compliments for having more posts than he himself!

Thanks, but he seems to have given both of us a thousand or 2 extra ones.

MelodyMar 3, 2014

+118725

0

MelodyMar 3, 2014

+118725

+14

Hi all
Another quiet Sunday/Monday
There were some great answers from reinout-g, ifrogot1 and mathlight and Alan. Thanks folks.
Alan, I am really impressed with your contributions. Thank you.
Reinout-g, thank you so much for taking charge of the puzzles and recreation posts. I consider them as a really important extension to every day 'school' maths. Whatever you can do to generate interest will be greatly appreciated.

I recieved a reply email from Andre Massow today outlining his intentions for development of the forum. Andrew Massow is the sole designer and operator of this website.
This is a quote from his letter.
"Thanks for your great eMail.
I am currently redesigning the question forum from scratch and you will be the first to see the prototype in the attached screenshot.
As soon as an working prototype is ready, I will send you an exclusive link so that you can have a look at the new features."

I am sorry Reinout-g but he did not mention your request. Maybe after he does these upgrades he may have time to look at requests such as yours.

I intend to reply to this email in the next day or two.
These are some of the thoughts that I am having.
1) I would like moderator rights. The main reason why I want this is so that I can remove really offensive (non-mathematical) material immediately.
2) Codeybarr30 only post unsolicited advertising and it would be more appropriate to de-register them than to give them posting recognition.
3) People who have not posted for a period of 2 months or so should not be included as top answerers. There are 2 members on this list that I have not even heard of.
4) I would really like a check-a-box thank you system to be introduced. This is a feature of other forums and it has a lot of merit.
5) Instead of stating the number of answers, it would be more helpful if the names of the answerers were given. Also, who posts the 'finished' tick?

I also want to talk to Andre about the possible problems with the calculator and see if we can get formulas etc easily from the calculator to the forum.
It would be good if we could have ongoing communication regarding the calculator and its development.
I see that Andre has overcome the problem with the ad blocker. The advertising is necessary for fund raising and the ads are not intrusive. (They are in the calculator section)
I had requested an extra page or two, for information posts etc, but I think Andre does not want to do this and it is not vital to us.

Would any one like to comment on or add to this list ?
You can post on this thread if you have something to add, OR I will make a new post in the body of the forum and you can post there if you prefer. OR You can send me a private message if you prefer to.

This is the attachment screen shot.

MelodyMar 3, 2014

+118725

+1

I just took a look about and the source code does not appear to be available. sorry.

MelodyMar 3, 2014