Question 157356: EXCUSE MAY SOMEONE PLEASE HELP ME WITH THIS PROBLEM
3X+3Y+AX+AY
Answer by josmiceli(19441)   (Show Source):
You can put this solution on YOUR website! 
It's a fact, not easy to find, sometimes
that the letters at the END of the alphabet,
U,V,W,X,Y, and Z
are used for variables that can be any
number, depending on other variables.
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The letters at the beginning of the
alphabet are used for CONSTANT variables,
A,B,C,D,E,F, ETC.
a constant varible can have any value, but
once you pick one, it never changes in the
equation in which it appears.
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Imagine that  (or any number)
Then you have
But I don't know what  really is, so
 answer
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