Which of the following correctly defines a constant?

A constant is defined as a fixed numerical value that does not change. This means that regardless of other variables in a mathematical equation or expression, the value of a constant remains the same. For example, in the equation (y = 5x + 2), the number 2 is a constant because it always represents the same fixed value regardless of the value of (x).

On the contrary, variables represent changing values, while multiplication factors refer specifically to coefficients in equations, which may not necessarily be constants. Therefore, recognizing that a constant is a static value, as described in the correct answer, is fundamental to understanding various mathematical concepts, including algebra, functions, and equations.