How is a constant defined in mathematics?

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In mathematics, a constant is defined as a value that does not change; it remains the same regardless of the circumstances surrounding it. For example, the number 5 is a constant because it always represents the same value and does not vary. This consistent nature makes constants vital in equations and calculations, distinguishing them from variables, which can change depending on the situation.

To clarify why the other options do not define a constant accurately: a variable that changes implies an ability to take on different values. A number with an exponent refers to a mathematical expression that involves raising a number (the base) to a certain power, but this does not necessarily imply constancy. Lastly, a mathematical expression can contain various elements, including constants, variables, and operators, so it does not specifically define what a constant is.

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