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

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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

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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 read more ..

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Melody Mar 15, 2022

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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

off-topic

Melody Mar 13, 2022

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WELCOME BACK CPHILL !

Melody Feb 11, 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. read more ..

Melody Feb 1, 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 read more ..

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Melody Jan 9, 2022

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HAPPY BIRTHDAY CHRIS!

Melody Dec 20, 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 read more ..

off-topic

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Melody Nov 4, 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

off-topic

Melody Oct 29, 2021

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put the -24 in brackets

MelodyNov 7, 2013

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hi Rosey,
did you understand the tax stuff that I sent last time?
You didn't comment on it.
I am happy to look at your work and to make comments but I won't actually do it for you.
if you want to send me something private make sure you do it with a private message.
also I am not a book keeper or accountant so I mightn't get it right.

I was serious when i said "now it is your turn"
I want to see that you are learning from what i write.
Melody
--------------------------------------------------------------
Hola Rosey,
¿Has entendido lo impuestos que envié la última vez?
No comentarlo.
Estoy feliz de ver su trabajo y hacer comentarios pero en realidad no lo haré por ti.
Si quieres enviarme algo privado Asegúrese de que hacerlo con un mensaje privado.
también no soy un guardián del libro o contador así no podría hacerlo bien.

Iba en serio cuando dije "ahora es tu turno"
Quiero ver que estás aprendiendo de lo que escribo.
Melodía

MelodyNov 7, 2013

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0

What is x if (x/3)+6=7

either subtract 6 from both sides and then multiply both sides by 3

or

Multiply everthing by 3 then subtract 18 from both sides.

MelodyNov 7, 2013

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Good, maybe you can come and wash my windows. lol

MelodyNov 6, 2013

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a 50 kg sack rice is being pulled by a farmer the force causes the sack to accelerate at 5m/s2 . calculate the net force that produced the acceleration

Force = mass * acceleration = 50*5 = 250N (This is on a horizontal surface and friction has not been taken into consideration)

You may like to look at this site.

http://library.thinkquest.org/10796/ch4/ch4.htm

MelodyNov 6, 2013

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Alexander went to his ATM and drew out a large amount of money for his expenses. For Christmas presents for his family, he spent $15 more on books than on CDs, which cost $15 more than toys. Cards were one-fifth the cost of toys and one-third the cost of calendars, which were $36. Alexander now had $27 left.

Alexander bought
books, cds,toys,cards,and calenders

calenders = $36
cards were 1/3 the cost of the calenders = $12
cards were 1/5th the cost of toys, which means that the toys were 5 times more than the cards. So toys = $60
cds cost $15 more than toys so cds=$75
Books cost $15 more than CDs so books = $90
Total cost = $273

How much did he get from the ATM? $273+$27 = $300

MelodyNov 6, 2013

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what is the square root of 12 ?

root12 = root(4*3) = root4 * root3 = 2root3 (This is root12 simplified)

But countrygirl is also correct. She has provided an approximation correct to 2 decimal places.

*

MelodyNov 6, 2013

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1/2 x (7.8+9.6)x6.1

Just put it straight into you calculator - don't forget the * sign.

MelodyNov 6, 2013

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12 to 3 odds that you cannot roll two even numbers with the roll of two fair dice. What can you expect if you play 200 times

I think that this question is riddled with errors.
There are 36 number combinations that you can get when you roll 2 dice. (different coloured dice)
9 of those are have 2 even numbers.

So the odds of NOT getting 2 even numbers is 27 to 9. OR 3:1 (read as 3 to 1)
The probability of NOT getting 2 even numbers is 27/36 = 3/4 (read as 3 in 4)

If I roll the 2 dice I would expect to get approx 3/4*200 = 150 rolls where the numbers are NOT both even.

MelodyNov 6, 2013

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what is the domain of x^2-4/x^2-4x-1?

domain is all x where x is not equal to 0 (because you can't divide by 0)

MelodyNov 6, 2013