член: Melody

921 Questions
34315 Answers

-2

1729

+118687

Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
прочитайте больше ..

●●

Melody 2 апр. 2022 г.

-10

593

+118687

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. прочитайте больше ..

●

Melody 16 мар. 2022 г.

-4

1401

+118687

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 прочитайте больше ..

●●●●●

Melody 15 мар. 2022 г.

-5

856

+118687

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

прочитайте больше ..

Не по теме

●●●

Melody 13 мар. 2022 г.

-6

833

+118687

WELCOME BACK CPHILL !

●●●

Melody 11 февр. 2022 г.

-6

706

+118687

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. прочитайте больше ..

●●

Melody 1 февр. 2022 г.

-8

867

+118687

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 прочитайте больше ..

●●●●●●●●●●●

Melody 9 янв. 2022 г.

-8

979

+118687

HAPPY BIRTHDAY CHRIS!

прочитайте больше ..

●●●

Melody 20 дек. 2021 г.

5469

+118687

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 прочитайте больше ..

Не по теме

●●●●●●●●●

Melody 4 нояб. 2021 г.

-10

1075

+118687

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

Не по теме

●

Melody 29 окт. 2021 г.

+118687

That is the same only to 1 significant figure.
cheers.

Melody11 окт. 2013 г.

+118687

First I googled the density of fresh water at 20 degrees celcius and got 998.21Kg/cubic metre
I changed the Kg to grams and the 1cubic metre to cubic cm and did the division.
If the density of the material is greater than water it will sink, if less then it will float.
that's my logic anyway.

get back to me if you want more help or to check you answer against mine.

Melody11 окт. 2013 г.

+118687

You are very welcome
did you get 3645 / (9^3) = 0.499 g/cm ³ (to 3 significant figures)

Melody11 окт. 2013 г.

+118687

I think you mean inverse sin. Sometimes called arcsin
NOTE: inverse sin is totally different from (sin x) ^-1 which means 1/sinx

sin 30 ^o = 1/2 = 0.5
therefore
arcsin 0.5 = 30 ^o
or it might be written as
sin ^-10.5 = 30degrees

on a calc you press
asin 0.5=
or
inv sin 0.5 =

You just have to be very careful that the calculator is displaying degrees rather than radians. This is a common error.

Melody11 окт. 2013 г.

+118687

yes, that is right.

Melody11 окт. 2013 г.

+118687

Density is mass divided by volume, does that help?

Melody11 окт. 2013 г.

+118687

Well,
How many beats in 1 minute?
How many beats in 2 minute?
How many beats in 3 minute?
How many beats in 10 minute?

How many minutes in an hour?
Do you get where I am going here?

Melody11 окт. 2013 г.

+118687

first you should recognise that these are all lines.

one solution means that the lines will cross each other
no solutions mean that they are parallel so the ?? will be the same
infinite solutions mean that they are the same line,

I hope this is enough to get you started.

Melody11 окт. 2013 г.

+118687

Remember that if the quadratic formula does not make sense
I mean the discriminate b ²-4ac < 0 then there are no solutions.

Melody11 окт. 2013 г.

+118687

Sorry, this question does not make sense.

Melody11 окт. 2013 г.

Имя пользователя	Melody
Гол	118687
Membership
Stats
Вопросов	900
ответы	33647