dan19_83

lol. agreed

http://www.physicscentral.com/resources/interactive.html

Just doing a quick search in google gave me the link above. there is a whole list of experiments you can do, even with household items!!

Is there a particular science field you are intersted in e.g chemistry, physics, biology, ecology, etc etc etc???

here's one I just thought of' date=' maybe it is too hard, see if anything clicks:

 

this is a sequence of numbers, what sequence is it?

 

 

A, W, MG, MAL, PPPM,...[/quote']

 

If a=1, b=2 etc. So i gave all the letters there respective numbers and added them up. didn't come up with an answer yet, just wrote it down in order to try and make i easier! Am i going in the right direction?

1, 23, 20, 26, 61, ....

thanks for the link' date=' reverse.

let's move on to another problem

I thought Callipygous might offer one, but he declined

 

 

 

I cant remember what all has been posted and what has not!

Let's just toss out problems and see if anyone can answer. Even if it is buried somewhere probably no one will search SFN for answers, see if you can answer from your own head. If you remember the answer from an earlier SFN thread, fair game! you win (for remembering)

 

this may or may not have been asked already

 

 

continue this sequence:

 

2, 5, 5, 4, 5, 6, 3, ....[/quote']

 

 

2, 5, 5, 4, 5, 6, 3, 5, 4,

 

the first and third numbers have a difference of three, with a five in the middle. The fourth and sixth numbers have a difference of two with five in the middle. therefore the seventh and ninth will have a difference of one with a five in the middle.

i think this is wrong but i said i'd try it.

Oh hi I'm bobeo. I just signed up. I sort of like to type.

Looks like buzsaw likes to type too!!

I think you'll only be banned if your extremely rude to someone or post something very inappropriate. welcome

You could do your parents taxes for them!!

Seriously though, i think the best thing is to get a maths book and start doing some of the difficult sums without using a calculator. If you do enough of them in your head you'll be a whizz after a while. Practices makes perfect is what i've been told!

I'm level six aswell, it doesn't sound too nice!

That's why we're here

Is this what you are looking for?

http://www.scienceforums.net/forums/showthread.php?t=9549&highlight=matrix+latex

Personally, I hate these kind of things (I did the British equivalent and failed miserably ) but the best way of training for these things is to tackle lots of past questions. They're written in a certain style - you can train yourself to a certain extent. I never saw the appeal personally.

I agree. Whenever i'm study for a maths tests i just do as many examples of the questions as possible. I never try and learn formulas. If you do enough questions, the formulas will be planted firmly in your head

yes i did presume that. I worked it out like I was figuring out the odds of winning a lotto with forty numbers, chose four.

He hasn't really specified which way he wants them pulled out.

Lets just say we're both right!!

here's my take on this.

The odds of the first one is 4 out of 40.

The odds of the second on is 3 out of 39.

The odds of the third one is 2 out of 38.

The odds of the fourth one is 1 out of 37.

To get the probabilty of pulling out 1, 2, 3, and 4 in the first four picks is then calculated by multplying all four probabilities together:

(4/40)*(3/39)*(2/38)*(1/37) = 1/91,390

Odds are not good!!

Do you want to tell us what the USAMO is?!! never heard of it

Hey I need some more help.

I've managed to get rid of a few things that that virus meesed up but there are still a few things that i can't do on my laptop that I am worried about.

1. I can't right click on my desktop or any file on my computer but i can right click on the taskbar at the bottom of the screen.

2. When I go to control panel and try and change my desktop background, I can't click on any of the files in order to get a preview of the screen. (makes sense i hope).

3. When the virus installed itself it seemed to put in its own desktop. I have found my original desktop in my documents and settings. How do I activate this desktop on start up and not the one that the virus seemed to install?

Any ideas?

i just do it one place at a time

 

5*1.00 = $5.00

5 * .10= $.50

thats $5.50

5*.07= .35

thats 5.85

 

thats the order i always do it in too' date=' not sure why. seems like it would be easier if i started with the smaller stuff.[/quote']

 

 

That's my way of doing it too. it's fast and easy and you know that if you get the answer worng, then at least you'll be close to the answer.

divisibility with 9`s

 

if I give you the number: 18855 if you add each number as an idividual like: 1+8+8+5+5= 27

now add the 2 and 7 you get 9.

 

so 18855 is divisible by 9 (infact it goes in 2095 times).

 

this works with ANY number that 9 will go into perfectly

 

also you know that 3 will too.

That's not a general maths rule or anything, is it?

Does it only work for 9 and 3.

When you divide by a small number e.g. (6/0.5) you get a larger number, 12. as the number get smaller under the line, the answer gets bigger and bigger until you eventually reach infinity. any number divided by zero is generally accepted as being infinity.

If the number above the line is negative then the answer just becomes -infinity.

Any update? I hope things are working out.

Two sexist jokes to liven up your day.

Well, the men will probably laugh anyway!!

What's worse than a Male Chauvinist Pig?

A woman who won't do what she's told

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

Scientists have discovered a food that diminishes a woman's sex drive by 90%.

It's called a Wedding Cake.

Here are two webstes that describe a step by step process for removing the virus and it's related entitys' date=' they are quite simple to follow: -

 

http://www3.ca.com/securityadvisor/pest/pest.aspx?id=453076689

 

http://securityresponse.symantec.com/avcenter/venc/data/backdoor.haxdoor.html

 

Although it may help to download this bit of kit : -

 

http://www3.ca.com/securityadvisor/pest/pest.aspx?id=453076689

 

to control browser based addons, and get rid of any malware manually.

 

Edit: - The backdoor.haxdoor disables firewalls, so I'd recommend you physically disconnect from the internet as soon as you have a copy of the removal guides. If you have it, it's reporting back to the owner right now.

These look good, thanks for your effort. Thank you all.

I'll be delighted if my laptop is ok after this, sounds like it will.

Damn hackers!

wow, thanks everyone for yer quick and helpful reponses.

I managed to sort out a few things that the virus messed up but there are still a few things left. I'll try and skim through everything that ye have posted and try and fix this damn laptop.

Dan its a little beauty' date='

Its not really malicious it keylogs for passwords/ creditcard details etc,then emails them to some scumbag.Apart from that it wont harm your pc.

As it does a really good job of hiding itself, a manual removal i imagine would be a little daunting and pointless if you dont delete all its parts.Before you remove it you need to turn off system restore(i hate it btw) because it hides in there as well and no Av software can clean your restore folder(just a little bit of info) so PM me with your email and i will give you a small AV that removes it auto.

Then i rec you buy a good AV like mcaffee(around £40)or NAV 2005 money well spent!

Obviously i cant supply you with these its illegal

And thats it really just be carefull in future what you DL[/quote']

 

I'll pm you my e-mail address now. thanks

 

 

Because it's only a crappy laptop and i probably won't need it for much longer, i won't be investing in anything like Mcaffee but i will try and download the free stuff off of the internet (if i fix it).

 

For future reference for anyone: I went onto a website and was able to get a free virus scan called panda. It was actually quite good, i'd recommend it to anyone who has a virus.

http://www.pandasoftware.com/products/activescan/com/activescan_principal.htm

 

Just click on free scan and away you go! probably worth doing even if you don't think you have a virus.

I was dowloading something off of a website today and i clicked on a link and guess what. I got a big fat virus. A good one too i must admit cause i've spent all freaking day trying to get rid of it and just will not go away .

It's called the backdoor.haxdoor virus i think. i've tried everything, ad-aware, spybot, stinger, symantec, but if anyone has anysuggestions, then that would be great.

Another idea i got from a friend yesterday was slight gust of wind.?