Melody

921 Questions
34316 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
lire plus ..

Melody 2 avr. 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. lire plus ..

Melody 16 mars 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 lire plus ..

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Melody 15 mars 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

Hors sujet

Melody 13 mars 2022

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WELCOME BACK CPHILL !

Melody 11 févr. 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. lire plus ..

Melody 1 févr. 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 lire plus ..

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Melody 9 janv. 2022

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HAPPY BIRTHDAY CHRIS!

Melody 20 déc. 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 lire plus ..

Hors sujet

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Melody 4 nov. 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

Hors sujet

Melody 29 oct. 2021

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I already gave one hint for this one.
second hint:
A part of it will be 19-11

Melody29 oct. 2013

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I have 1 angle and 2 lenghs what do i do? i need the other lengh
I am assuming that you are talking about a triangle.
If you have the included angle you use the cosine Rule
If you don't have the included angle then you need more informations.

Melody29 oct. 2013

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4k+mn=n-3;n solve n 3ab-2bc=12;c solve c z=(x+y/3)w;y

I don't understand your notation.
Are these 3 separate questions?

Do you mean ?

a) 4k+mn=n-3 Make n the subject

b) 3ab-2bc=12 Make c the subject

c) z=(x+y/3)w Make y the subject

Melody29 oct. 2013

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There is no answer because the square root of a negative number does not exist (not in the 'real' world anyway)

When you get this as an answer to a quadratic equation it means there is no solution.

Melody29 oct. 2013

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8ln(x+5)-5ln(x)=

= ln(x+5) ⁸ - ln(x) ⁵

= ln [(x+5) ⁸ / (x) ⁵]

Melody29 oct. 2013

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(7x^6)^3 = 7 ³ * x ^(6*3)

Melody29 oct. 2013

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what is 0.050 mol * 8.314427 J/Kmol * 400K / 202.6kN/m^2?

I posted your question in mymathforum.com and this is the answer that i received

Volume question.JPG

I understand this, would you like some help with the manipulation?

Melody29 oct. 2013

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Joan drive 333.5 miles before she has to buy gas. Her cargets 29miles per gallon. How many gallons of gas did the car star out with ?
Put the fractions upright and try and think about what I am saying
units in fractions can cancel out the same as numbers can

miles/1 * gallons/miles = gallons (because the miles cancel out)
and
29miles per gallon = 29miles/1gallon

If you can go 29 miles on 1 gallon of petrol then
1 gallon of petrol will take you 29miles

So if the rate is 29miles/1gallon it is equivalent to say that the rate is 1gallon/29miles

333.5miles * 1gallon/29miles = 333.5/29 gallons ( the miles cancel out)

I sure other forum users will look at this and say I made a huge deal out of a little problem.
This is true, but if you master this method of dealing with rates you can do all sorts of very difficult rate problems.

Melody29 oct. 2013

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Hi, I'm in Calculus class and I wanted to know how to answer this question - The distance from one side of the stadium is 756.7 kilometers and 18518235.78 millimeters. 7m/34s is how fast Eric ran the race. What was his time?

18518235.78 millimeters = 18518.23578m = 18.51823578 km
756.7 kilometers This must be a stadium for volcanos to play on. A volcano is the only animated thing that seems big enough. lol
The numbers in your question simply don't make sense.

Melody29 oct. 2013

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Q= 25(1/2)^t/1620
determine the initial quantity when t=0

Q= 25*(1/2)^t/1620
sub in 0 to t
Q= 25*(1/2)^0/1620
Anything to the power of 0 is 1
Q= 25*1/1620
Q= 25/1620

Melody29 oct. 2013