What term describes a mathematical phrase that contains variables, functions, numbers, and/or operations and does not contain an equal or inequality sign?

• A. Variable
• B. Formula
• C. Function
• D. Expression

Answer: (D)

An expression is a mathematical phrase that combines numbers, variables, functions, and operations and does not include an equals or inequality sign. It represents a value that can be simplified or evaluated, like 3x + 5, sin(x) − 4/x, or (a + b)^2. If you see an equals sign, as in 2x + 3 = 7, you’ve got an equation, not just an expression. A single symbol like x is also an expression, since it stands for a value. Formulas describe rules (often with an equals sign) and functions describe relationships that map inputs to outputs, so they’re distinct from a standalone expression.