Melody

921 Questions
34315 Answers

-2

1730

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+118690

Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
lee mas ..

Melody 2 abr 2022

-10

594

1

+118690

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. lee mas ..

Melody 16 mar 2022

-4

1402

5

+118690

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 lee mas ..

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Melody 15 mar 2022

-5

857

3

+118690

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

Fuera tema

Melody 13 mar 2022

-6

836

3

+118690

WELCOME BACK CPHILL !

Melody 11 feb 2022

-6

707

2

+118690

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. lee mas ..

Melody 1 feb 2022

-8

869

11

+118690

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 lee mas ..

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Melody 9 ene 2022

-8

1

980

3

+118690

HAPPY BIRTHDAY CHRIS!

Melody 20 dic 2021

+4

1

5471

9

+118690

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 lee mas ..

Fuera tema

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Melody 4 nov 2021

-10

1077

1

+118690

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

Fuera tema

Melody 29 oct 2021

+118690

0

How do you multiply and simplify?
x(2x+1)(x-3)

x(2x+1) = x*2x + x*1 = 2x ²+ x

Now
( 2x ² + x ) ( x-3) = 2x ² * (x-3) + x * (x-3)

then you expand those brackets and collect the like terms.
Can you finish it?

If you had of wanted to you could have worked out what (2x+1)(x-3) was first and then multiplied by x afterwards.
You can multiply in any order
eg 3*2*6 = 2*6*3 = 3*6*2

Melody30 oct 2013

+118690

0

I was called away in the middle of writing this and there were some mistakes which I think i have now fixed.

I put a lot of effort into explaining this so I hope you try hard to understand it.

best of luck.

Melody30 oct 2013

+118690

0

round to the nearest 10th 3.899

The 8 is in the tenths place
You will use the next 9 for rounding
After that the digits have no relevance - I suggest you cross out the irrelevant digits so that you will get less confused.
so the question is the same as

round to the nearest 10th 3.89 (which is the same as round to 1 decimal place)
Now if the number in the next place (9 in this case) is smaller than five then you truncate

eg round to the nearest 10th 3.8 2 = 3.8
eg round to the nearest 10th 3.8 4 = 3.8

If the next number is 5 or bigger than 5 then the value goes up by 1
eg round to the nearest 100th 3.8 9 = 3.9
eg round to the nearest 100th 3.7 5= 3.8

If the last digit that you need to put up by 1 is 9 then you have to put the 2 last digits up, (with these ones you have to keep the zero after the point to show that you have rounded to 1 dec place)
round to the nearest 10th 5 3.96 = 54.0 (i think of it as 39 goes up to 40 BUT keep the decimal point in the same place)
round to the nearest 10th 5 3.99 = 54.0

If the last 2 digits that you need to put up are both 9 then you have to put the 2 last digits up,
round to the nearest 10th 8 59.95 = 860.0 ( i think of it as 599 goes up to 600)
round to the nearest 10th 79.95 = 80.0 ( i think of it as 799 goes up to 800)

and so on.

Melody30 oct 2013

+118690

0

You are very welcome.

Melody30 oct 2013

+118690

0

none - you weren't one of the original 60 people

Melody30 oct 2013

+118690

+5

Multiply or divide as indicated. Simplify your answer, if possible. (Do not express answer in exponential form.) 10/10^-2

10 ^-2 = 1/ 10 ⁺² = 1/100

10 divided by 1/100 = 10 * 100/1 = 1000

Melody30 oct 2013

+118690

0

http://www.asknumbers.com/kilopascal-to-megapascal.aspx

Melody30 oct 2013

+118690

0

scientific notation value for (2.35E6)(-3.7E-3)

Why didn't you just do it on your calculator? I just tried to do it on mine and I will admit I kept getting error messages.

(2.35E6)(-3.7E-3)
= -2.35*3.7 * 10 ^6-3
= -2.35*3.7 * 10 ^6-3
= -8.695 * 10 ³

Melody29 oct 2013

+118690

0

Use the given conditions to write an equation for the line in point-slope form and in slope-intercept form
(-9,-2) y=-3x+4

I don't understand your question.

Melody29 oct 2013

+118690

0

heparin drip is to be started at 12units/kg./hr. Patient weighs 180 pounds. How many units will be infusing?

1kg = 2.20462 pounds

180 pounds = 180 / 2.20462 = 81.6467 Kg (4dp)

12units/kg * 81.6467 Kg = 979.67 units per hour

Melody29 oct 2013