Final answer:
An algebraic expression is a mathematical phrase that includes numbers, variables, and operations. Fractions are not necessary, but they can be included if needed for a particular problem or equation.
Step-by-step explanation:
An algebraic expression is a mathematical phrase that includes numbers, variables, and operations. The only option that is not required in an algebraic expression is fractions. Fractions are not necessary, but they can be included in an algebraic expression if needed for a particular problem or equation.