SOLUTION: Is 3 an algebraic expression? Why or why not?

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Question 307048: Is 3 an algebraic expression? Why or why not?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
No, 3 is a number.
Algebraic expressions usually involve an unknown variable of some sort such
as "2x-10" while something like "3+4" would be a mathematical expression.