To simplify the expression \( \frac{9}{3}x + 4 + 2x \), first simplify \( \frac{9}{3}x \):
\[ \frac{9}{3}x = 3x \]
Now, replace \( \frac{9}{3}x \) in the original expression:
\[ 3x + 4 + 2x \]
Now, combine the \( x \) terms:
\[ 3x + 2x = 5x \]
So the expression simplifies to:
\[ 5x + 4 \]
Thus, the correct response is:
5x + 4