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

That was an interesting one. I would never have guessed it either. Thanks ILS
Thanks for the site too.

MelodyFeb 23, 2014

+118725

+14

Hello everyone,
This was a very quiet Fri/Sat which is perfectly normal and understandable. Even the most academic amount us do not want to do homework on a Friday night.
There were some great answers from Princess Sophie E, I like Serena, Spoonify & Rom, Kitty<3 and sp3ctr3. Thank you all.
There was also a nice thank you from Hayden. Good manners are always appreciated.
Goodnight all,
Enjoy your Sat/Sun.
Melody.

MelodyFeb 22, 2014

+118725

0

Hayden:
thank you very much my exams are coming for year 6 a very big exam so i had a practice paper
im 11 turning 12 and i am a girl

You are very welcome Hayden. Best of luck for you big exam.

MelodyFeb 22, 2014

+118725

0

Guest:
1. times the two non radical numbers together
= 10√3

can 10 split into any numbers that can be squared? can 10 be squared? no? then you're done.

final answer: 10√3

Hi guest,
Your answer is correct but 10 can be squared. 10 ²=100

I think what you meant was
Is there any square numbers that go into 3. No - then this cannot be simplified any further.

MelodyFeb 22, 2014

+118725

0

MelodyFeb 22, 2014

+118725

0

It wasn't Pancake's friends. It was me.

They were yummy

MelodyFeb 22, 2014

+118725

0

Guest:
P = (−2.55, 0.726), Q = (4.55, 4.79), R = (0.306, 6.36) .
a) Find the angle of vertex P

There are 3 different ways that you can do this.

Method 1: Angle between two lines
tan(<P) = | (m ₂-m ₁) / [ 1+m ₁m ₂ ] |

Where
m ₁ is the gradient of PQ and
m ₂ is the gradient of PR

----------------------------------------------------------------------------------------------------------------------------------------------
Method 2 : Cosine Rule

p ² = q ² + r ² - 2qrCos(<P)

Where
p is QR, q is RP and r is QP

----------------------------------------------------------------------------------------------------------------------------------------------------
Method 3 : Using Vectors

Cos(<P) = ( <PQ> · <PR> ) / ( |<PQ>| |<PR>| )

P = (−2.55, 0.726), Q = (4.55, 4.79), R = (0.306, 6.36)
<PQ> = < 4.55 - - 2.55 , 4.55 - 0.726 > = < 7.1, 4.064 >
<PR> = <2.856, 5.634>
<PQ> · <PR> = ( (7.1 x 2.856 + 4.064 x 5.634 ) = 43.174176

|<PQ>| = distance PQ = 8.180837
|<PR>| = distance PR = 6.316541
----------------------------------------------------------------------------------------------------------------------------------------------------
No matter which method you choose the answer is still <P = 33 degrees and 20 minutes (to the nearest minute)

MelodyFeb 22, 2014

+118725

+14

Hello all,
Great answers were presented today from drewdrew222, Rom, Princess Sophie, guest and Kitty<3. Thank you, all of your answers are appreciated.
I cannot think of anything else that I need to report.
My weekend has begun. However, for most of you I hope that Friday treats you well.
Best wishes
Melody.

MelodyFeb 21, 2014

+118725

0

MelodyFeb 21, 2014

+118725

0

Virtualnana:
–3(5 – 15n) = 15(3n – 2)

-15 + 45n = 45n - 30

-15 = -30

There are no solutions.

MelodyFeb 21, 2014