The point of using letters in algebra is that they can stand for any number (or a range of numbers that are, as yet, unspecified). There is no specific letter allocated to a number.
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An unknown number
Yes, if you know the number and the letter's number, then you multiply them together.
"n" stands for an unknown number.
In algebra, there will be letters. Each letter represents a number. Different letters stand for different numbers. e.g. x=1 but y=3. if there are many X's, they all mean the same thing.If there is a number before the letter, you multiply the number by what the letter represents. So 3p means 3*p. This is very simple algebra. I haven't learned complex algebra yet, but i can understand it. But can't explain it well.
a variable