Simplify: \( 3 \sqrt{4}+5(9-3) \)

To simplify the expression \( 3 \sqrt{4}+5(9-3) \), we start by calculating each part. First, we find \( \sqrt{4} \): \[ \sqrt{4} = 2. \] Now, substituting back, we have: \[ 3 \sqrt{4} = 3 \cdot 2 = 6. \] Next, we compute \( 9 - 3 \): \[ 9 - 3 = 6. \] Then, substituting this back into the expression gives: \[ 5(9-3) = 5 \cdot 6 = 30. \] Now we can add the two results together: \[ 6 + 30 = 36. \] Thus, the simplified expression is \[ \boxed{36}. \]