What is the value of the term '3' in the expression '3 + x'?

In the expression '3 + x', the term '3' is classified as a constant term. A constant term is a fixed value that does not change regardless of the value of the variable it is paired with—in this case, 'x'. This means that no matter what value is assigned to 'x', '3' will always remain equal to 3.

On the other hand, variables like 'x' can represent different values, which contributes to their classification as variable terms. This distinction is important in algebra, as it helps to differentiate fixed values from those that can vary depending on the context of the equation or expression. The classification of '3' as a constant term also indicates that it serves as a stable reference point in mathematical operations. Other choices may refer to characteristics of mathematical terms, but they do not accurately describe the role of '3' in this expression.