Member: Melody

921 Questions
34315 Answers

1742

+118725

Mathigon website

I just discovered a site called mathigon

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

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Melody Apr 2, 2022

-8

609

+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 ..

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Melody Mar 16, 2022

-2

1459

+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

+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

WELCOME BACK CPHILL !

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Melody Feb 11, 2022

-5

717

+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 ..

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Melody Feb 1, 2022

-7

889

+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 ..

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Melody Jan 9, 2022

-6

996

+118725

HAPPY BIRTHDAY CHRIS!

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

+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

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Melody Oct 29, 2021

+118725

Der:
could you please solve 2 cos (5x + 10) = 1 For 0< x < 360

cos(5x+10) = 1/2
Firstly cos is positive in the 1st and the 4th quadrants (I use "ALL Stations To Central" to remember this)

I have drawn a equilateral triangle of side length 2 units. (Angles are all 60 degrees)
I have then bisected it to form 2 congruent 30,60 90 degree triangles
The height is sqrt(3)
I draw this every time I want trig ratios for 30 and 60 degree angles.
I recognise cos(theta)=1/2 as one such ratio.
From the diagram it can be seen that cos(60) = 1/2
First quadrant is 60 degrees+360n, 4th is 360-60=300+360n degrees (Where an is in the set of integers)

5x+10=60, 420, 780, 1140, 1500
5x = 50, 410, 770, 1130, 1490
x = 10, 82, 154, 226, 298,

5x+10 = 300, 660, 1020,1380, 1740
5x = 290, 650, 1010, 1370, 1730
x = 58,130, 202, 274, 346

So the answers (in degrees) are x = 10,58, 82, 130, 154, 202, 226, 274, 298, 346

My answer and Alan's answer still don't mesh. I'll do some more homework. This is fun.
140302 30,60,90 triangle.JPG

MelodyMar 2, 2014

+118725

yanty:
100 div 336

If your calculator is broken there is one on this site.

MelodyMar 2, 2014

+118725

Guest:
30 + (.0825 x 30) + (15% x 30) =

Jut put it straight into your calculator. 15% is 15/100

MelodyMar 2, 2014

+118725

Stu:
This is a quadratic equation right?
Can you show me the steps to solve.

y = 2cos(x) + x² + 2x - 7

Hi Stu,
Where did you dig this up from?
No it is not a quadratic equation. It is not even a quadratic function.
It would be a quadratic function if it did not have the 2cos(x) in it.
As for solving it, there is nothing to solve. It is just y =.
to solve it it would have to be some number equals (without the y)

I graphed this function for you to show you what it would look like.
But that is it from me on this one.
140301 Stu.JPG

MelodyMar 1, 2014

#53

+118725

+14

Hello everyone,
It was a very quiet Friday/Saturday. This is completely usual.
There were some great answers posted by 19fieldsm, Alan, Lexiie96 and samgelinas.
19firldsm (meggy) and lexiie96 joined us today. Welcome to Web2.0calc forum. We hope you like it here.
Each day about a half dozen member join up. I usually only mention the ones that make posts, but you are all very welcome here.
I know there are members who are here regularly and never or rarely make posts. I get the very occasional post or private letter where people tell me how much they like to watch and learn from other people's posts. Some of these people, although I am sure not all, struggle with English. If you are one of these people, I think that is great.
Enjoy your weekend or what is left of it.
Melody.

MelodyMar 1, 2014

+118725

bump

MelodyMar 1, 2014

+118725

*
PRINTABLE PUZZLES - WEB SITE.

This site has many different printable puzzles. They also come in many different difficulty levels.
I really like the Kakuro puzzles but there are many good ones.

http://krazydad.com/ Highlight the address, right click then click on goto
This is a picture of the introduction page, You will have to go to the web page to get into the puzzles and print them out.

140228 Krazydad Printable Puzzles, Mazes and more.JPG

MelodyMar 1, 2014

+118725

Here is one someone can play with if they want to . I dug it out of the archives.

MelodyMar 1, 2014

+118725

Yes maybe. thanks Alan.

MelodyMar 1, 2014

+118725

judie:
/x/-2

I am not sure what you want to do.
I've never entered absolute signs on any calculator except when I am graphing a function.

MelodyMar 1, 2014

Username	Melody
Score	118725
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Questions	900
Answers	33647