सदस्य: Melody

921 Questions
34315 Answers

-2

1731

+118691

Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
और पढ़ें ..

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Melody 2 Apr 2022

-10

596

+118691

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. और पढ़ें ..

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Melody 16 Mar 2022

-4

1404

+118691

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 और पढ़ें ..

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Melody 15 Mar 2022

-5

859

+118691

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

WELCOME BACK CPHILL !

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Melody 11 Feb 2022

-6

708

+118691

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. और पढ़ें ..

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Melody 1 Feb 2022

-8

870

+118691

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 और पढ़ें ..

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Melody 9 Jan 2022

-8

981

+118691

HAPPY BIRTHDAY CHRIS!

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 और पढ़ें ..

विषय से परेे

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Melody 4 Nov 2021

-10

1077

+118691

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

विषय से परेे

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Melody 29 Okt 2021

+118691

Chase:
-3x(2x^2-5x+4)=??

-3x(2x ²-5x+4)
will become
= -3x*2x ² -3x*-5x -3x*4
that is
= [-3x*2x ²] + [-3x*-5x] + [-3x*4]

I am assuming the main confusion is the minus signs. There are many different, yet correct, ways to think about the minus signs.
This is not quite the way I would ususally do it but I thought it might be easier to understand this way.
A +- together makes a minus, so the fact that i have added extra plus signs just doesn't matter.
After you simplify all the terms inside the square brackets then you can simply remove the brackets. They all have plus signs in front of them so it won't really change anything.
Can you finish it yourself? If not sure or you want me to check your answer post again (but show me what you have done)

Melody12 Jan 2014

+118691

Now fsad, thankyou for answering but what was Suzy supposed to learn from that, you didn't tell her how you did it

Suzy:
what is 2/3 of $899.00

of is multiply so it is just

2 divided by 3 multiplied by 899 =

Melody12 Jan 2014

+118691

guest:
sin(x)=7/13 ???

This is an inverse sine or arcsine problem because it is the angle that you need to find.
If you are using degrees, check that you calulator is in degrees mode. There will probably be a tiny little D at the top of the screen.
now
inverse sign of (7/13) is written as, sin ^-1(7/13)
(Don't confuse this with a power of -1 they are completely different, the notation is dumb, but what can you do )

Now, if you look at the sin button on your calculator it will have a little sin ^-1 written above (in colour coding) . This means that you have to press an INV or a 2nd funct button at the top of the calc to use the notation
so it's

INV SIN (7/13) = (then you might need to press the degrees minutes and seconds button to get it to display as an angle)

I hope that you got a lot out of this explanation!

Melody12 Jan 2014

+118691

kkkitty:
what is the square root of 36

What multiplied by itself equals 36?

Melody12 Jan 2014

+118691

Guest:
-15x^2-5x+9+(-6x^2)-19x-16+(-15x^2)

First i am going to use the Sup (superscript) button above the smilies so that I can read it easier.

-15x ²-5x+9+(-6x ²)-19x-16+(-15x ²)

Now I am going to take away the brackets because they are not doing anything.

= -15x ²-5x+9 +-6x ²-19x-16 +-15x ²

Now if two signs (+ or - ) are so close together that you can put a circle around them without anything else in the circle, then put circle them.
If they are both the same, ++ or -- replace them with a plus, If they are different +- or -+ replace them with a minus.
so you question becomes.

= -15x ²-5x+9 -6x ²-19x-16 -15x ²

Now collect the like terms, do you know how to do that? Remember the minus sign always belongs to the term behind it eg 6 -2x+3x = 6 + x

You can post you answer if you are not sure. Just include my last line of working so that it is easier fo me to follow

Melody12 Jan 2014

+118691

vicky28:
(λx^2 - x + λ^2 - 5) + (x^2 + λ^2x - 4λ)

You haven't actually said what you want, do you just want to simplify it?

(λx ² - x + λ ² - 5) + (x ² + λ ²x - 4λ)

= λx ² - x + λ ² - 5)+ x ² + λ ²x - 4λ

There are no 'like terms' so all you can do is remove the brackets.

Suggestion : questions like this are easier to read if you use the sup (superscrip) button that is located above the smilies.

Now I have a question for you, how did you include the lambda signs in the post? Do you have a special keyboard?

Melody12 Jan 2014

#48

+118691

jazz:
I've tried ... I can't get to 734.
Here's the closest I got.
(100 + 3 + (75/25))*7 -7 = 735

Thanks for joining in Jazz, that is the closest I could get too!
(I am assuming that was the earlier puzzle that no one could do)
Hey Jazz, why don't you take a look at that logic puzzle (on Sporcle) that I keep sending Puzzled off to try.
It is on a puzzle post down the page.

Puzzled's one that is waiting for someone else to solve is
75,100,8,8,2,1 magic number 896

Melody12 Jan 2014

+118691

ruth:
what is ordinary notation

Thanks Jazz, that was a good explanation of scientific notation

--------------------------------------------------------------------------

Hi Ruth,
Ordinary notation is just ordiary decimals and whole numbers
eg
5, 2000, 0.0034186, 0.3repeater, etc

Melody12 Jan 2014

#46

+118691

Hi Puzzled
Thanks for that input
I want you to have a go at the logic puzzle on the game site that I posted down the page a bit.
Please tell me if you can get it out.

75,100,8,8,2,1 = 764 <-- but not this one yet

8 x (75+8)+100 = 764
I got this answer quite easily, i will tell you how.
I immediately saw that 8 x 8 = 64 so I needed the 700
8 x 75 = 600 and there is the 100 sitting in the numbers not used yet
so i have
8 x 75 + 8 x 8 + 100 = 764
I can factorise out the 8 to get
8(75+8)+100 = 764
----------------------------------------------------------------------------------------------------------
Puzzled's one that is waiting for someone else to solve is
75,100,8,8,2,1 magic number 896

Melody12 Jan 2014

+118691

Mizzi:
h,2h-k,3h-2k,.....until 15 first term

I assume you want to find the sum to 15 term.

Hi mizzi,
You have 2 series here
the first is h, 2h, 3h, .......15h
the second is 0, -k, -2k, ..........-14k

you find the sum of the first series and find the sum of the second series (using the formulas). Then add the two answers together.

Melody11 Jan 2014

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