Final answer:
The given expression, 7n + 10n + 3, is a cubic trinomial.
Step-by-step explanation:
The given expression, 7n + 10n + 3, is a type of polynomial. More specifically, it is a cubic trinomial. A polynomial is an algebraic expression that consists of variables and coefficients, combined using addition, subtraction, and multiplication. In this case, we have two terms with the variable 'n', namely 7n and 10n, and a constant term 3. Since the highest exponent of 'n' is 1, the polynomial is a linear polynomial. Additionally, since it has three terms, it is a trinomial. Therefore, the correct answer is d) Cubic trinomial.