Math Is Fun Forum

what does the dot above y and x mean?

if commas are not allowed, are just putting them together allowed? (i mean for example 6, 7 and 5 can be put together to 675)

because below your name it says "Real member"

i found the maya indians very fascinating. they used a counting system with 20 as base and did also create the concept zero very early. http://en.wikipedia.org/wiki/Image:Maya.png
they also did very accurate astronomical observations.

i also think i read somewhere that they predicted the end of the world, when translated to our calendar, to year 2012-2014 at the same time as a meteor will come very close to the earth

which means you take all numbers up to that number multiplied with eachother (starting with 1 or 2). for example 4! = 1*2*3*4=24
aaaaand now i realize that the same thing happens here as with the exponents, its the same as using all these numbers.....darn

and if u allow negative numbers, there are some more combinations

the distance has nothing to do with the solution. Just the time and the flies speed?
i think the solution is correct

im using them sometimes, but i dont post all answers, i just  use them to practise. but many of these exercises are things that i have never seen before . an introduction on each exercises or a link to how to do it would be really great, then i can maybe learn something new. Anyway keep up the good work =p

nik, {hide=answer}write text here{/hide} creates a hide button {=[   and }=]
and do you really need to do a new post for every new exercise you solve??

hm you could put the answer after every exercise in a hide button. like this:

7x+12=2-3x

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edit: hm i was wrong, nvrm