Melody

921 Questions
34315 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
और पढ़ें ..

Melody 2 Apr 2022

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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. और पढ़ें ..

Melody 16 Mar 2022

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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 और पढ़ें ..

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Melody 15 Mar 2022

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859

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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

और पढ़ें ..

विषय से परेे

Melody 13 Mar 2022

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WELCOME BACK CPHILL !

Melody 11 Feb 2022

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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. और पढ़ें ..

Melody 1 Feb 2022

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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 और पढ़ें ..

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Melody 9 Jan 2022

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HAPPY BIRTHDAY CHRIS!

और पढ़ें ..

Melody 20 Des 2021

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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 और पढ़ें ..

विषय से परेे

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Melody 4 Nov 2021

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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

विषय से परेे

Melody 29 Okt 2021

+118692

0

Gabriella1D1502:
Olivia ties 2.5 feet of ribbon onto one balloon. How many yards of ribbon does Olivia need for 18 balloons?

There are 3 feet in a yard so
Olivia needs 2.5/3 yards of ribbon for 1 balloon

So can you work out how much she will need for 18 balloons?

Melody6 Feb 2014

+118692

0

Stu:
a) How do I simplify 27^ -1x^ -1 / y^ -2?

27^-1x^-1 / y^-2 = y² / 27x

Please note:I used the 'sup' button above the smilies to write this.

b) What are rules for + - / * when you've a negative ^ -1 on a fraction bottom?
I am not sure what you mean but if the +- is not a part of the index you leave it alone.

c) As above when the ^ -1 is on top, is there time not to flip it or it cannot be flipped?
Well, they would all have to be factors in the numerator and the denominator.
for example
140206 neg indices.JPG

d) Does simplify have the ability to remove all negative powers in all equations?
Yes, I guess so - but it might be long and messy.

Melody6 Feb 2014

+118692

0

Thanks reinout-g

Melody6 Feb 2014

+118692

0

bob:
ok got it its 23 ft away

I don't think so Bob.
Your question was a little different from the one in the example

I think that it is

4 * 260 = d * 80

Look back at the page I sent you to and see if you can work out why the questions are a bit different from each other.

Oh and thank you for answering the other person's question.

Melody5 Feb 2014

+118692

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bob:
An object that is 260 lbs and 4 ft away from the fulcrum is exactly balance with a ballerina that is 80 lbs. how far away is the ballerina from the fulcrum

Hi Bob,
Why don't you try and work it out yourself?
This page will help I think.
http://www.onlinemathlearning.com/lever-problems.html

Melody5 Feb 2014

+118692

0

esmehan:
what is the total number of the two-digit prime numbers that have a 3 as a unit

Hi esmehan,
I am wondering why you can't do this for yourself.?
Do you mean that you want 3 in the unit column, so do you mean that is must have a 3 in either place?

anyway, you only need to think about
3,13,23,33,43,53,63,73,83,93 and decide it they are prime and then count them.
It it is in either place you will need to look at all the 30 somethings as well.

Melody5 Feb 2014

+118692

0

jomorgan:
what is the value of one-half of two-thirds of three-quarters of four-fifths of seven-eighths of nine-tenths of one thousand?

Hi jomorgan,

It is just
1/2 * 2/3 * 3/4 * 4/5 * 7/8 * 9/10 * 1000

The 2s cancel out
the 3s cancel out
the 4s cancel out
so it simplifies to
1/5 * 7/8 * 9/10 * 1000 = 157 and a 1/2

Melody5 Feb 2014

+118692

+17

Hi everyone,
Today we had some great answers from Rom and J-Rad, thank you, your efforts are much appreciated.

It was a very quiet day. This morning the forum was full of snark posts. I am sorry Rom, that you were so bombarded. I have not seen so many for a very long time.
I think that these posts should be totally ignored. I have found that silence is a very good deterrent. The young people who have been here for some time know that this is what I think and they are usually supportive of my position.
Also, I have no problem with a little bit of play happening in here and if anyone wants to join in on some harmless fun I most certainly have no objection. I would like the forum to be a little light hearted sometimes.
My only exception to 'the silent treatment' is if you discover any bullying, even if it is only very mild. If you see any bullying could you let me know asap please. You can either send me a private message (I check them fairly regularly) or you can leave me an attn: post, with the attn post symbol that I have been using in the margin. If I am not around I guess you will have to play it by ear. Don't make threats that you can't back up, don't stoop to bullying the bully. Just tell the person very firmly that their behaviour is not acceptable in this forum. If they want to stay they have to 'be nice'. In the past I have always found that this is enough. If the bullying is very mild it can be dealt with more gently.

Please check for messages regularly. You just have to left click on your username. There are no automatic reminders here.

I sent 'Admin' a note last night thanking them for providing this forum for us and asking if they could do some upgrades. I asked if it would be possible to get more pages so that we could separate different types of posts and I ask if they could install LaTex into the forum. The message is still sitting in my outbox which means that they have not opened it yet. Web2.0calc has never responded to any of my messages so I won't hold my breath, but I will keep you updated if there are any developments.
Thank you,
Melody.
Edit: I nearly forgot, there is a question that i answered but I am not sure of, maybe someone would like to take a look.
http://web2.0calc.com/questions/tolerance-question

Melody5 Feb 2014

+118692

0

miki.mae:
4-T=8
what does T=

The aim is to get T by itself.
If you take away 4 from both sides then you will be left with -T on the left.
You can then Multiply both sides by -1 to get rid of the minus sign.

Melody5 Feb 2014