Melody

921 Questions
34315 Answers

+1

1

1742

2

+118725

Mathigon website

I just discovered a site called mathigon

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

Melody Apr 2, 2022

-8

609

1

+118725

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 ..

●●●●●

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

+118725

WELCOME BACK CPHILL !

Melody Feb 11, 2022

-5

717

2

+118725

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

11

+118725

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 ..

●●●●●●●●●●●

Melody Jan 9, 2022

-6

1

996

3

+118725

HAPPY BIRTHDAY CHRIS!

Melody Dec 20, 2021

+5

16

5552

9

+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

●●●●●●●●●

Melody Nov 4, 2021

-9

1091

1

+118725

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

ohnonotmath:
0.15 = 0.3 + x(0.33)
1-x

I hope this comes out right. the 0.3 + x(0.33) is all over 1-x

Hi ohnonotmath,
Your explanation of the question is good and leaves little room for misinterpretaion but I will show you how you could have presented this problem.

0.15 = (0.3 + x(0.33)) / (1-x)

0.15 = (0.3 + 0.33x) / (1-x)
At this point you need to recognise that you cannot divide by 0.
therefore 1-x cannot = 0 --> x cannot = 1
Now, multiply both sides by (1-x) to get rid of the fraction.

0.15(1-x) = 0.3 + 0.33x
Can you take over from here? I will check your final answer if you want me to.

MelodyMar 30, 2014

+118725

+9

Hi all,
Another quiet day. There were some great answers from Bertie, CPhill, I like Serena and dophysics. Thank you.
Stu also provide another useful link post on his Top Free Site thread. Thanks Stu.
Enjoy what is left of your week end.
Melody.

MelodyMar 30, 2014

+118725

+1

MelodyMar 30, 2014

+118725

0

Thanks for that great answer Chris,
I just felt like drawing a picture.
If you want to play with GeoGebra, this might be a good one for you to try and reproduce.
Melody.
140330 trapezium.JPG

MelodyMar 30, 2014

+118725

0

cydneeyx3:
Katie spent $7.24 on lunch at the mall. She bought a CD for $13.78 and a pair of jeans for $24.71. While she was at the mall, one of her friends paid her back $20 that she had borrowed from Katie. If katie now has $49.27, how much money did she take with her to the mall?

You could do it the other way around too.

Katie has $49.27 but her friend just gave her $20 so before that she had $29.27. As CPhill already worked out she had spent $45.73 at the mall.
So when she first entered the mall she must have had $29.27 + $45.73

MelodyMar 30, 2014

+118725

0

gotenks0906:
:oops: 5x=3x+4

Take 3x off both sides - that will result in all the xes being on the same side.
There will be a number in front of the x.
You have to work put how to get rid of that number (with +, -, x, or divide) And then you will have to do it to both sides.
Then you will have your answer.

MelodyMar 30, 2014

+118725

+9

Hi all,
Today was very quiet which is normal for a Friday/Saturday. Thank you Chris for answering the couple of questions.
Enjoy your weekend.
Melody.

MelodyMar 29, 2014

+118725

0

3l3v3n11:
simplify (2u^-5v^-1)^-3

It will be mucheasier to see what you are doing if your fractions are upright.

Have a look at this post on how to deal with negative indices.

If you have any questions, please ask.

http://web2.0calc.com/questions/negative-exponents-negative-indices

Just highlight the address -> left click -> choose "goto"

MelodyMar 29, 2014

+118725

+9

Hi everyone,
There is a lot to report this Thursday/Friday.
Firstly Andre Massow replied to my email and says that he thinks he has fixed the posting problems that people have been having this week. Today there have been many more lower level posts so that is probably the reason. Thank you again to the guest who notified us of this problem. Your exact wording also help Andre pinpoint the problem.
Great answers were delivered by CPhill, Alan, PhDSmith, Redtriangle, Bertie, Samgelinas and Rom. A big thank you to each of you.
Thank yous were given by Ineedhelp, notsomathpro, and Ohnonotmaths. We really like it when people show their appreciation.

We had 8 new people join today (at last count) I don’t normally do this but I have sent each new person a welcoming message. If you left click on your username you will find the message centre. Just click into it. Anyway, welcome to the forum. We hope you learn lots and have fun here.

Web2 BETA Version.
Andre Massow has allowed me to view the beta version of the coming new web site. I should explain to new people that this will be implemented sometime in the foreseeable future. It is not a full working site yet but many of the features are already working. Many of you will be thrilled to know that Andre has included LaTex as well as a Math Formula button. These features will be fantastic. I’ve already sent Andre a letter discussing some of the more obvious pros and cons.
It appears that Andre has omitted the icons in the margin, this is a real concern to me, it is the only way that we can readily recognise info posts etc. I have asked if they can be reinstated. I have also asked if it would be possible to ‘freeze’ some of our info posts at the top of the first page because they are going to disappear very quickly otherwise. This is because there will be a lot less posts per page.
I don’t know is Andre can or will do these things but at least we are communicating.
Here is a little look at the proposed new post page.
140328 beta version new post.JPG

That is probably enough of a wrap on this very wet Sydney evening.
See you next time.
Melody.

MelodyMar 28, 2014

+118725

0

Guest:
where do we type it

Go to vogue.co.uk and using your arrow keys type in this code: up, up, down, down, left, right, left, right, B, A.

The easiest way it to highlight the blue address -> left click -> choose 'goto' and it will open in a new page

Or

You could just copy and paste the address into your browser at the top of the page. and then click enter.

MelodyMar 28, 2014