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What is a letter used to represent a numeric value in an expression or an equation?
It can be any letter of any alphabet: Roman, Greek.
What represents an unknown or changeable value?
In mathematical expressions, a variable (a letter used to represent a certain value) represents an unknown or changeable value. It is often the variable x.
What decimal value does the letter A represent?
Without context, it is difficult to say. I guess you are referring to number bases greater than 10 where letters are used to represent digits above 9; the first digit would be A, the second B and so on. In these cases the letter A is being used to represent 10 times the column value where it is. For example in hexadecimal, the A in 0x6A3 represents 10 x 16 = 160 in decimal (since it is in the sixteens column of the number).
What is a letter or symbol used to represent an unknown value?
If you are talking about math then its usually " x " but if that is already use in the expression and you want to use another symbol to represent a DIFFERENT number then you can use y or a or so on.
Letter used to represent one or more numbers?
A letter used to represent numbers is called a variable; the most common ones are 'x' and 'y'.
