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Melody
Username
Melody
Score
91051
Stats
Questions
836
Answers
24627
855 Questions
25104 Answers
+2
81
2
+91051
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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84
6
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Maths Humour
A little maths humour. Thanks OBT
off-topic
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Melody
Nov 8, 2017
+2
125
3
+91051
Learning the periodic table
Learning the periodic table
I really like this video - it is the first in a set.
read more ..
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Melody
Oct 27, 2017
+4
110
1
+91051
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
201
4
+91051
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
140
3
+91051
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
+3
442
8
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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
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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
273
4
+91051
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
297
4
+91051
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
106
3
+91051
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
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344
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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
408
2
+91051
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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I'm sorry but the question does not make sense.
Melody
Sep 29, 2013
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What is the absolute value of 9?
What is the absolute value of -9?
There are 2 possible equations to make the problem true.
So, there are two answers.
I don't actually want to do it all for you.
Is this enough help?
Melody
Sep 29, 2013
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What does BM stand for?
Melody
Sep 28, 2013
#2
+91051
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The square root of 5 is an irrational number so it cannot be written exactly as a fraction or a decimal. It can only be estimated.
Melody
Sep 28, 2013
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+91051
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Initially y dash = 50*sin 53.1 degrees x dash = 50*cos 53.1 degrees
y=0 x=0
ongoing
y"=-g (I'll use -10) x"=0 ignore wind resistance
y' = -10t + 50sin 53.1 x'= 50*cos53.1
y= -5t^2 +(50sin53.1)*t x= (50cos53.1) *t
When y = 25
just substitute into the appropriate equation and solve with a quadratic equation.
I got 7.31 sec and 0.68 secs but I might have made a mistake.
This is enough to get you started. hope it helps.
Melody
Sep 28, 2013
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I am not going to do the whole question for you but i will try to explain.
If g(x)=3*t - 6
then g(2) would equal 3*2 - 6 = 0
g(-4) = 3*(-4) - 6 = -18
g(a) = 3*a - 6
Just replace the original thing in the bracket with the new thing in the bracket.
Melody
Sep 28, 2013
#2
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I'm sorry, I don't get what Scott is saying although it would be easier to follow if this site allowed maths type.
Any way the question can only be answered if the original log is base e. So I will assume that.
log e^x = xloge = x*1 = x
So log (base e) of e^(2x+2) = 2x+2
The problem becomes 2x+2 = 7 The answer is x = 2.5
Melody
Sep 28, 2013
#1
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This is a region, there are an infinite number of answers.
First graph 5x+7y=57 It will be a dashed line because the less than sign is used.
then test a point (0,0) would be good.
If it satisfies the equation you shade in that side of the line, if it doesn't you shade in the other side.
Hope this helps.
Melody
Sep 28, 2013
#1
+91051
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There is no solution to this equation.
You are asking when does 5x-55 = 5x+9
This will be true when -55=9, in other words it will never be true.
Melody
Sep 28, 2013
#1
+91051
0
It would be -1 because this is the only possible value for x
Melody
Sep 28, 2013
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