Is known as a constant.
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You can replace a variable with an equal value or expression. Just make sure the same variable always gets the same value or expression.
No. It is a constant. A variable is something that changes value in certain circumstances; pi always has the same value.
It is called a constant and it value remains the same.
The sum remains the same, yes.
The constant variable is usually the 'X' variable or the variable that stays the same. For example, it may be the 'X' variable or the same number.