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

-10

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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

That is impressive.
Thanks Alan

Melody27 Feb 2014

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0

help:
(6.3e2)e-6

Is this what you mean?

(6.3e^2)e^-6

which can be better written again as

(6.3e ²)e ^-6

I did this by using the 'sup' button located above the smilies. 'sup' stands for superscript.

anyway, if this is what you meant then the answer is

6.3e ^-4 = 6.3/e ⁴

Melody27 Feb 2014

+118692

0

COxford wrote:The radius r in millimeters of a platinum wire L centimeters long with resistance 0.1 ohm is r=0.059L1/2. How long is a wire with radius 0.236 millimeter?

Hi coxford,
If you had labelled your question, Physics or Resistance it most likely would have been answered this morning.
People come in and look for the type of question that they are interested in answering, then they leave again.
Your title was 'Algebra', it was not of interest to someone looking for Physics questions.

Melody27 Feb 2014

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0

Alan wrote:
COxford wrote:Water collected in a rain barrel can be used to water plants and reduce city water use. Water flowing from an open rain barrel has a velocity v=8h1/2, where v is in feet per second and h is the height of the water in feet. Find the height of the water if it is flowing at 16 feet per second.

Square both sides of the equation; rearrange to get h on its own; plug in the given value of v and calculate h, (I'm assuming that the units of the 'number' 8 are such that the result will be so many feet!).

Thanks Alan,
What did you interpret 8h1/2 to actually mean?

Melody27 Feb 2014

+118692

+14

Good evening all,
Well, it is evening if you are in Australia or New Zealand. The rest of you have to put up with 'Australia' time.
I was a busy girl today. Lots of great questions. I did get some much appreciated help from idkman, I like Serena, apt5004, kitty<3 and Alan. Thank you.
I also got 1 nice thankyou from a guest.
All questions are answered except 1 and a bit.
I will bump both of them when I finish this post.
Thank you all and good night.
Melody.

Melody27 Feb 2014

+118692

+6

NEW PUZZLE
Rules:
You have to use some or all of the numbers to make the magic number. You are not allowed to use any of the numbers twice. (Unless one was written twice in the first place)
You can use brackets, +, -, x, or divide and that is it.

EASIER ONE
9,3,7,1 and the magic number is 66

HARD ONE
2,5,5,6,8,10 and the magic number is 97

Happy Calculations

Melody27 Feb 2014

+118692

0

I changed the address to make it more clear.

Melody27 Feb 2014

+118692

+11

Hard one (quite famous actually):

You are on a tv-show where you can win a million dollars. The flamboyant host asks you to pick one of three boxes.
In two boxes you will find nothing, but one box will give you a million dollars.
You pick a box and the host then decides to play a trick with you.
Since he knows what is inside each box he opens one of the boxes that has nothing in it.
He then asks you the million dollar question.
Will you stick with the box you picked, or will you switch to the other box?

Should you stick with the bos you picked, should you switch or is it irrelevant what you do?
Explain why please
---------------------------------------------------------------------------------------------------------------------------------------------------------
Okay Reiner-g, so you are saying that the probability that you chose correctly in the first place is 1/3
But the probability that the other cup iscorrect is 1/2
therefore if you swap cups your chance of being correct increase from 1/3 to 1/2 (an increased chance of 1/6 = 16.6% ? )
No I am still not right. Where did the 66.6% come from

Melody27 Feb 2014

+118692

0

anon1:
3xy-xy

you have 3 lots of xy and you take away an xy
that's the same as
you have 3 lots of xy and you take away 1xy

= 2 lots of xy
= 2xy

Melody27 Feb 2014

+118692

0

FckUrMthr:
from the top of a building 80 metres high, the angle of depression of a car parked on the ground is 52 degrees. find the distance of the car from the base of the building

If you want me to answer you next time you can find yourself a new username.
The smutty language of the playground is not appropriate here!

Here's you answer. A thank you would be nice.

Melody27 Feb 2014