To determine the number of terms in the expression $3x^2 + 3y - 3x + 4$, we need to identify each distinct term. A term is a part of the expression that is separated by addition or subtraction symbols.

Let's examine the expression term by term:

1. $3x^2$
2. $+ 3y$
3. $- 3x$
4. $+ 4$

Each of these terms is distinct and separated by a plus or minus sign. Therefore, there are 4 terms in this expression.

Would you like a breakdown of why each part counts as a distinct term, or do you have any other questions?

Here are 5 related questions that could expand on this topic:

1. What is the degree of each term in the expression $3x^2 + 3y - 3x + 4$?
2. How do you identify like terms in an expression?
3. Can the expression $3x^2 + 3y - 3x + 4$ be simplified further?
4. What is the coefficient of $x$ in the expression $3x^2 + 3y - 3x + 4$?
5. How do you combine like terms in a polynomial?

Tip: Always look for like terms to combine and simplify expressions, as it can help reduce the number of terms and make further calculations easier.