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Melody
Username
Melody
Score
91797
Stats
Questions
848
Answers
24941
868 Questions
25437 Answers
+1
114
6
+91797
A question for Alan.
Alan, I would like to know how to do MonteCarlo simulations.
I decided to ask publicly because maybe other people would like this too.
Can you show me or do I need a special program?
Thanks :)
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Melody
Feb 7, 2018
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+91797
Happy Birthday Heureka
A little message just told me it was Heureka's birthday yesterday!!
I hope you had a great day Heureka
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Melody
Feb 1, 2018
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A trig exact ratio memory trick.
This trig memory trick from TheXSquaredFactor is really good.
It is for 'remembering' the sine and cosine of angles that most students are told to memorize.
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Melody
Jan 23, 2018
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+91797
Problems with LaTex
Latex has not displayed properly for a couple of weeks now.
Have other people had a problem or is it just my display?
For instance, this answer of Hectictar only displays as coding for me, it does not display as it should.
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Melody
Jan 13, 2018
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+91797
Testing image upload - told it was broken
image upload
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Melody
Jan 8, 2018
+5
189
4
+91797
HAPPY NEW YEAR !!
I wish for all members and guests to have a faulous 2018 year!!
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Melody
Jan 1, 2018
+2
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5
+91797
HAPPY BIRTHDAY GENO3141 !!!
From all the members of Web2.0. We wish you a really great birthday !!
read more ..
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Melody
Dec 27, 2017
+4
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Merry Christmas everyone
Merry Christmas everyone
Here are some of our traditional Australian Christmas songs.
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Melody
Dec 25, 2017
+7
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HAPPY BIRTHDAY CPHILL
Happy birthday Forum Champ!!
We hope you have a super terrific day!!
read more ..
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Melody
Dec 19, 2017
+5
331
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+91797
Neat geometry question (repeat)
I just found this old question
https://web2.0calc.com/questions/isosceles-amp-equilateral-triangles-perimeter-and-area
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Melody
Nov 13, 2017
+10
308
6
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Maths Humour
A little maths humour. Thanks OBT
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Melody
Nov 8, 2017
+2
323
3
+91797
Learning the periodic table
Learning the periodic table
I really like this video - it is the first in a set.
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Melody
Oct 27, 2017
+4
261
1
+91797
Graphing challenge
Can you match the equation (the 'y=' is missing) to the graph???
https://www.sporcle.com/games/arcer/identify-the-graphed-functions
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Melody
Oct 21, 2017
+2
399
4
+91797
Probability puzzles.
Here are some more probability puzzles.
1) If you break a stick in two places at random, forming three pieces, what is the probability of being able to form a triangle with the pieces?
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Melody
Oct 5, 2017
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#2
+91797
0
You have to add up the 4 lengths and then divide by 4 to get the average.
Melody
Sep 29, 2013
#2
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I think this question is in italian, I put it through a translator and this is what I got.
A trapezoid rectangle has the smaller base, the height and the oblique side respectively 9cm long, 4cm 5cm.sapendo cha and the projection of the oblique side on the basis mangiore is 3cm long, determine the extent of the perimeter
Unfortunately, I still don't understand the question. sorry.
Melody
Sep 29, 2013
#1
+91797
0
I have no idea what your question means.
Can you explain yourself better?
Melody
Sep 29, 2013
#1
+91797
0
With your fingers.
Melody
Sep 29, 2013
#1
+91797
0
You could do it on your calculator if you have a fraction button.
otherwise
27 1/4 - 12 8/9
= 27 + 1/4 - (12 + 8/9)
= 27 + 1/4 - 12 - 8/9
= 27 - 12 + 1/4 - 8/9
= 15 +1/4 - 8/9
hopefully you will recognise that 1/4 is less than a half and 8/9 is more than a half. The first one needs to be the biggest unless you want to deal with negative numbers.
So I suggest you change 15 + 1/4 into 14 + 1 + 1/4 and, 1 and a quarter is 5 quarters.
so
=14 + 5/4 - 8/9
Now, you cannot add or subtract fractions unless the denominators (bottoms) are the same. You must find a number that 4 goes into and 9 goes into. 4*9 will work and in this case it is the smallest one.
So you will have to change it to 14 + something over 36 - something else of 36
and I am going to let you finish by yourself.
Happy puzzling.
Melody
Sep 29, 2013
#1
+91797
0
How much does an atom of iron weigh? I guess you could google this just as easily as I could. Cheers.
Melody
Sep 29, 2013
#1
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0
Just convert the km to metres and do the division on your calculator. The units cancel out. the answer will just be a number.
or
You could convert the metres to km and do the division. The answer will be the same.
Melody
Sep 29, 2013
#1
+91797
0
The probability of getting at least one heart is the compliment of getting no hearts.
What I mean is, you either get a heart or you don't so the sum of these 2 probabilities is 1.
All probabilities are between 0 and 1 (0 = can't happen) (1 = must happen)
The probability that the first chosen is not a heart is 48/52
now there are only 51 cards left and only 47 of them are not hearts so
The probability that the second chosen is not a heart is 47/51 etc
So
The probability that none are hearts is
P(no hearts) = 1 - [ 48/52 * 47/51 * 46/50 * 45/49 ]
I hope that you LEARN from my answer.
Melody
Sep 29, 2013
#1
+91797
+5
Firstly what is bidmas? Do you mean BODMAS ? If you mean bidmas please tell me what the i stands for?
BODMAS stands for
Brackets then
of (as in power of) then
division and multiplication equally important just work left to right then
addition and subtraction equally important just work left to right
Your first question is so easy that I am sure you can do it yourself. Just try putting the brackets in different places until it works.
The second one is a bit tricky. What i will tell you is that it is not 4 squared. There is only one place that you can put the first brackets to change this. There will be 2 sets of brackets altogether.
good luck. Happy puzzling
Melody
Sep 29, 2013
#1
+91797
0
Without any brackets this expression is really
=35000 * x^2 - (x / 200) * x
=35000* x^2 - x^2 / 200
=x^2 * (35000 - (1/200))
=34999.995 * x^2
Melody
Sep 29, 2013
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