Melody

921 Questions
34315 Answers

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Mathigon website

I just discovered a site called mathigon

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

Melody 2 Apr 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. और पढ़ें ..

Melody 16 Mar 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 और पढ़ें ..

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Melody 15 Mar 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

और पढ़ें ..

विषय से परेे

Melody 13 Mar 2022

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WELCOME BACK CPHILL !

Melody 11 Feb 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. और पढ़ें ..

Melody 1 Feb 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 और पढ़ें ..

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Melody 9 Jan 2022

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HAPPY BIRTHDAY CHRIS!

और पढ़ें ..

Melody 20 Des 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 और पढ़ें ..

विषय से परेे

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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

विषय से परेे

Melody 29 Okt 2021

+118690

0

Hi md
I don't understand where the 50 degrees belongs. You haven't told me.
Have you drawn a picture? Have you had a go at the question yet?
What have you tried?

Melody23 Des 2013

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Well, per annum will never work for the reasons that i have already given (assuming first $3000 doesn't compound)

but I just workied it out as 'per some time period' and I got an answer close to 4 months.

I will show you. Maybe this is what was meant?

131223 latex compounding interest.JPG

Melody23 Des 2013

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Is it per annum, there was no 'a' in your question - I thought that this was a typo.
Was it meant to be per 'something' and you work out what the something is?

This would explain my problem.

Melody23 Des 2013

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I think that there is something wrong with your question or with the assumptions that we are making.
if you get no interest on the first $3000 then this is the same as $600 grows to $2944 in 7 years.
That is almost a 500% growth in 7 years!

At 7.25% pa for 7 years $600 will grow to
$990.98 if compounded every 4 months
or
$996.63 if compounded daily.

Even if it was compounded by the second it would not get to $2944!

Melody23 Des 2013

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I am not surte what you are trying to tell me.
Do you already know that the answer is 4 months and your want to show that this is correct?

If you let t be the number of compounding time periods per year
then
n = 7t
and
r=0.0725/t

If you want to test 4 months then t=3 (because there are 3 lots of 4 months in a year)
n=21
r= 0.0725/3
So you can test this - i haven't done it yet.

Do you just use formuas in this course or do you sometimes use tables as well?

Melody23 Des 2013

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hi random,
I haven't looked at it very hard yet but do you want me to assume that there is no interest earned on the first $3000?
This would mean that $3600 would grow to $5944 in 7 years
is the same as $600 grows to $2944 in 7 years if all of the amount attracts interest. Does that make sense to you?
when I say, is the same, I mean the interest rate would be the same.

Melody23 Des 2013

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None of the above,
Did you have fun making that question up?

Melody23 Des 2013

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You are very welcome Chris (I assume your name is Chris?)
It can be very frustrating when you get stuck on a question. I know this.

Melody23 Des 2013

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Well, if you are talking about the slope of a line on a number plane, you can put a little cross on two different points on the line.
Now you can get from one point to the other by going straight up and then straight across.
Here is a picture to help you understand.

131222 slope of a line.JPG

Melody22 Des 2013

+118690

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CPlusHRis:
11.11^11 in standard form to 4 significant figures.

why is this causing you trouble Chris, don't you understand significant figures? (You need to calculate 11.11^11 on your calculator first)

I'll give you a couple of examples
346285 = 350000 correct to 2 significant figures. This is because the first 2 nonzero numbers on the left are 34 the next one '6' is used for rounding, then the zeros are needed just to show place value.
It would probably be better to write this as 3.5 x 10 ⁵

7.00258 x 10 ^-4 = 7.0 x 10 ^-4 correct to 2 significant figures. (The zero is significant this time)

I hope that helps

Melody22 Des 2013