Usually in algebra the term "unknown" is used for a variable ( commonly designated as x ) you are trying to solve for. For instance the mathematical expression 2 + x = 5 may be presented to the student as a problem. The answer is to solve for the unknown or x. The solution would be x = 3
If you mean Unkown as in the pokemon, you can't.
Girls Only Man Unkown Kewl?
joe perrry 59 steven tyler 61 joey unkown brad unkown tom unkown
A expression in maths is a collection of terms without an equality sign.
division
What symbol
Related to.
Adding
"tenth"
direction
circle
The mean is usually the arithmetic mean - there are other means in maths. For a set of numbers, the arithmetic mean is the sum of the numbers divided by the number of numbers.