Melody

921 Questions
34315 Answers

-2

1731

2

+118691

Mathigon website

I just discovered a site called mathigon

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

Melody 2 Apr 2022

-10

596

1

+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 ..

Melody 16 Mar 2022

-4

1403

5

+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 ..

●●●●●

Melody 15 Mar 2022

-5

859

3

+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

और पढ़ें ..

विषय से परेे

Melody 13 Mar 2022

-6

837

3

+118691

WELCOME BACK CPHILL !

Melody 11 Feb 2022

-6

708

2

+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 ..

Melody 1 Feb 2022

-8

870

11

+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 ..

●●●●●●●●●●●

Melody 9 Jan 2022

-8

1

981

3

+118691

HAPPY BIRTHDAY CHRIS!

और पढ़ें ..

Melody 20 Des 2021

+4

1

5471

9

+118691

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

●●●●●●●●●

Melody 4 Nov 2021

-10

1077

1

+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

Melody 29 Okt 2021

+118691

0

Alexandre:
If I have 1million dollars and put it into an investment that returns 0,5% a month, considering I withdraw 10thousand dollars a month, in how many months I will have no money left? What's the formula that solves this question?

If I was doing it I would use present value of an ordinary annuity.
It is 'ordinary' because' banks pay interest at the end of each time period.
And it is 'present value' because the future value is 0.
Do you have the formula?
(I did it quickly and got just under 139 months)

Melody8 Jan 2014

+118691

0

Sadia:
(x+3)(x+3) using area model

I was thinking of showing people this just yesterday.

This is a square
How long are the sides?
Can you find the area of it?
140108 (x+3) square.JPG

Melody8 Jan 2014

+118691

0

leo24:
USE THE PYTHAGOREAN THEOREM TO FIND THE LENGHT OF THE FOLLOWING MISSING SIDE OF EACH RIGHT TRIANGLE . THEN FIND THE VALUE, 21,29

Hi Leo,
Firstly you haven't described the problem properly.
and secondly why are you having a problem, don't you know what Pythagoras's theorem is?

Melody8 Jan 2014

+118691

0

Have you drawn the picture? What does it look like? Describe it to me please.

Melody8 Jan 2014

+118691

0

Aranarth:
An urn contains 16 white b***s and 9 black b***s. 10 b***s are extracted from the urn, with replacement. What is the probability that less than 6 b***s are white?

I'm stuck Someone could please help me?

There will be a lot of working to get this answer.
Firstly it is a binomial probablity.
This is because

1) There are only 2 outcomes for each trial (white or not white)
2) the probabiliy of success for each trial always stays the same
3) the trials are indepentant of one another.

P(white)=16/25
P(not white)=9/25

Now you have to use binomial probability for each of these scenarios (and then add them all together to get the final answer)
P(0 white), P(1 white) ....... P(5 white)
Do you know how to do that? Can you work it out? If you want more help I want to see what you have tried first.
The more you can workout yourself, the better your learning will be.

Melody8 Jan 2014

+118691

0

bob:
:o
You entered a contest at a local restaurant. There are 3 grand prizes, 10 second prizes, and 40 third place prizes. If there are 200 entries, what is the probability that you will win second prize?
a. 1/20
b. 1/5
c. 1/12
d. 3/10
Im stuck

Hi Bob,
There are 10 second prizes and 200 entries so your chance of winning a second prize is 10/200 = 1/20

Melody8 Jan 2014

+118691

0

This was the question.
(a) Philip inherited $170,000. He invested it in a term deposit which earned 6.6% p.a. compounding every 4 months
How much did it grow to after 5 years?
(b) If you can do this one maybe you could tell me how much it would grow to after 6 years
(c) How much will it grow after 1/3 years.
----------------------------------------------------------------------------------------------------
Answer for all three of the above questions seperately. Don't worry about anything else. Just answer these questions properly.

1.What is the annual rate of interest for a? b ? c? Your answers were all 6.6%
2.how long is the compounding period. That is how often is the interest added. a? b? c?
3.for each of them, how many times per year is the interest added a? b ? c? Your answers for all of them was 12/ 4 = 3 (There are 3 'nets' each holding 4 months in a year)
4.What is the interest rate for each compounding period a? b? c? (This is r) Your answer for all of them was r = 0.066 / 3 = 0.022
------------------------------------------------------------------------------------------------------------------
I can see where you may have got the number 3 from but 4 months is clearly written in the question!
------------------------------------------------------------------------------------------------------------------
I suspect that you are not trying your hardest anymore. Perhaps you are more interested in watching the number of posts and the number of views grow.
I don't actually mind this, I find it entertaining as well.
You could keep posting genuine questions and genuine answers (that you have thought about properly) for ever, and then site numbers would grow huge.
Then you would not only have the largest number of posts and views, but the numbers would be even cooler because the posts would be genuine.
-----------------------------------------------------------------------------------------------------------------
Now, pull your socks up, and please tell me why I asked these four questions, and what I wanted you to understand after you answered them.
------------------------------------------------------------------------------------------------------------------

Melody8 Jan 2014

+118691

0

Welcome back Professor and Misz Lopez!
You have been missed.
And Happy birthday for yesterday Veronica. I hope that you had a great day.
Congratulations on your upcoming nuptuals. I am glad that you are happy.
Melody.

Melody8 Jan 2014

+118691

0

hi Random,
You must be reading a different question from the one I am reading. do you want to try that again.

Melody7 Jan 2014

+118691

0

*
Thank you Warped Tour Girl,
That is exactly what i was thinking
-----------------------------------------------------------------
*
I would really like for one of our younger students to answer this.

This is a diagram of rectangular yards. They are adjacent which means they share a fence. They are measured in metres.
The area of anything is how many squares will fit inside.
The areas of these yards will be measured in metres squared (or square metres) m ²
a) I want you to tell me the area of each of the yards separately
then
b) I want you to tell me the area of both the yards put together.

You can do this a few different ways. How many ways can you think of ?

So I want the answers but I want to know how you got the answers. More than one method would be good.

140118 adjacent rectangles.JPG

Melody7 Jan 2014