Final answer:
To combine the terms in the expression 9u³ - 5v, we only need to look at the like terms. In this case, there are no like terms because the terms have different variables. So, the expression cannot be simplified further and remains as 9u³ - 5v.
Step-by-step explanation:
The given expression is 9u³ - 5v, where u and v represent distinct variables. Since there are no like terms to combine, simplification is not possible as it relies on combining terms with the same variable and exponent. The expression remains in its original form, 9u³ - 5v. In the absence of common terms, the simplicity of the expression persists, and no further algebraic manipulation is feasible. Thus, option (a), 9u³ - 5v, accurately reflects the expression's simplest form. The distinctive nature of the variables u and v precludes any consolidation of terms, emphasizing the uniqueness and integrity of the original expression.