Final answer:
The term that cannot be combined with the others is 4x^2. It is a quadratic term with a degree of 2, while the other terms are linear with a degree of 1. In order to combine terms, they must have the same variable and exponent.
Step-by-step explanation:
The term that cannot be combined with the others is d) 4x^2. This term is a quadratic term with a degree of 2, while the other terms (a) 11x, b) x, and c) -3x) are all linear terms with a degree of 1. In order to combine terms, they must have the same variable and exponent. Therefore, 4x^2 cannot be combined with the others.