Melody

921 Questions
34316 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
lire plus ..

Melody 2 avr. 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. lire plus ..

Melody 16 mars 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 lire plus ..

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Melody 15 mars 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

Hors sujet

Melody 13 mars 2022

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WELCOME BACK CPHILL !

Melody 11 févr. 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. lire plus ..

Melody 1 févr. 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 lire plus ..

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Melody 9 janv. 2022

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HAPPY BIRTHDAY CHRIS!

Melody 20 déc. 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 lire plus ..

Hors sujet

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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

Hors sujet

Melody 29 oct. 2021

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while shopping for school clothes Janice and patty spent more than $175. Janice spent $34. how much did patty spend?

More than (175-34) dollars

Melody6 nov. 2013

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if I have 1301,000.19 and the irs take10% and fed.tax tahe 20% what is left.

70% is left

70/100* 1301000.19 =

Melody6 nov. 2013

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It probably looks like a b/c
It is supposed to look like a mixed numeral only with letters.

Melody6 nov. 2013

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A contractor wants to use 34 feet of molding, cut into three pieces, to trim the sides and top of a garage door. The long piece is 1.5 feet longer than three times the length of each shorter piece. Find the length of each piece.

Sounds like the short pieces are both the same length. Let them each be x feet long.
Three times the short piece is 3x feet
The long piece is 1.5 feet longer than 3 times the short piece. That must be 3x+1.5 feet

Add them all together and you get

x+x+3x+1.5 = 34

then you solve the equation to get the value of x.

Melody6 nov. 2013

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The subway train offers access to all twelve intersections downtown. If every intersection is .75 miles apart and the train travels at 20 mph and spends 45 seconds at every stop to unload and onboard new customers, how long will it take to get from the first intersection to the last intersection?

When you do a question like this use a similar smaller question to see what is happening.
I h ave given you my solution to an alternate question.
I decided to look at the same question but with only 4 stop. I draw the train line on a piece of paper.
The distance travelled was 0.75*3 = 2.25miles
1hour/20miles * 2.25miles = 0.1125hours = 0.1125*60min = 6.75minutes = 6 minutes and 45 seconds
The number of stops where the train waited was only 2 because the first and last don't count.
stops = 2*45seconds = 90seconds = 1 minute and 30 seconds

6 minutes and 45 seconds + 1 minute and 30 seconds = 8minutes and 15 seconds.
This answer is for 4 stops only.

Try copying the method only do it for the whole 12 stops.
When I did it i got 32minutes and 15seconds but I haven't checked my working so if you get a different answer it doesn't necessarily mean that you are wrong.

Good luck. If you do some but get stuck you can ask for help again.

Melody6 nov. 2013

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(12/81)/x=4/9

(12/81)*(1/x)=4/9

multiply both sides by x (to get x off the bottom)
then
multiply both sides by 9/4 (to get x by itself)

now get the answer on your calculator.

Melody6 nov. 2013

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what is 2 to the square root of 41

It is 2 to the power of (1/41)
and you can do it on your calculator.

Melody6 nov. 2013

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5b-4-8b-9

You can only combine like terms and the negative sign belongs to the term after it.
so put a circle around 5b
and a circle around -8b
5bricks - 8 bricks =? (it will be a negative number of bricks)

now just tack the answer to -4-9 on the end.

Melody6 nov. 2013

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Melody6 nov. 2013

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s the sequence 1/2, 1/3, 1/6, 0 arithmetic?

It is an AP if
T2-T1 = T3-T2 = T4-T3 (=d)

So you work it out!

Melody6 nov. 2013