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Melody
Username
Melody
Score
91038
Stats
Questions
836
Answers
24622
855 Questions
25099 Answers
+2
67
2
+91038
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
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79
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+91038
Maths Humour
A little maths humour. Thanks OBT
off-topic
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Melody
Nov 8, 2017
+2
123
3
+91038
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
107
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+91038
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
197
4
+91038
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
+2
136
3
+91038
Area Puzzles
Here are 2 area puzzles. Bertie drew my attention to them.
Those of you who have been here a long time will remember Bertie.
They were in http://fivethirtyeight.com/
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Melody
Oct 5, 2017
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436
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PUZZLES
I think it is time for us to have a new puzzle thread
THIS THREAD WILL BE AVAILABLE IN THE STICKY TOPICS
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Melody
Sep 24, 2017
+3
311
3
+91038
LaTex Coding
LaTex is a mathematics presentation language that can be used on this forum.
It is used in many other places as well.
This can be very confusing when you first use it but if you start with little things like using it to write
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Melody
Sep 21, 2017
0
268
4
+91038
How to upload a picture
Please use this hyperlink to see instructions.
https://web2.0calc.com/questions/instructions-on-uploading-pictures#r4
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Melody
Sep 16, 2017
+1
295
4
+91038
Have you had login problems - please comment
I have just been informed that a member is having problems signing in lately.
I'd like to know if anyone else has had any problems?
Could you please comment - especially if you to have had problems.
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Melody
Aug 1, 2017
+1
104
3
+91038
Interesting questions and answers - Melody's collection
1) Write 25/27 as the sum of 3 fractions wach with a numerator of 1. (8/7/17)
An interesting answer by CPhill.
https://web2.0calc.com/questions/good_6
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Melody
Jul 8, 2017
+1
342
3
+91038
Repost: I am interested too.
Helperid bought my attention back to this question.
https://web2.0calc.com/questions/very-hard-math-question-for-my-profile-picture
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Melody
Jun 24, 2017
+2
406
2
+91038
Ein großes Willkommen bei deinen beiden neuen Moderatoren!
On behalf of everyone I would like to thank admin and congratulate Omi67 and asinus on becoming moderators for the web2.0calc German forum today.
This forum has had little moderation for some time
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Melody
May 21, 2017
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#2
+91038
0
You have to add up the 4 lengths and then divide by 4 to get the average.
Melody
Sep 29, 2013
#2
+91038
0
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
+91038
0
I have no idea what your question means.
Can you explain yourself better?
Melody
Sep 29, 2013
#1
+91038
0
With your fingers.
Melody
Sep 29, 2013
#1
+91038
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
+91038
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
+91038
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
+91038
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
+91038
+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
+91038
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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