Kindly help me to know,what r Matrices n Determinants and what are their use in applied Mathematics?

You can go on wikipedia...

Matrix (mathematics) - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Matrix_%28mathematics%29)

And using further links for going deeper in the subject.

Please do not write in irritating, mind-numbing IM format. Save that for the cellphones.

Wow, what a temper!

I was not trying to be a smarta** when I said that. It's just that there is time for that kind of writing and a time not to use it. Please do not get into the habit of writing like that all the time.

Huh? She changed yr rating galactus!