1. The problem is to simplify the expression $\sin 6 + x \cdot 9$. 2. Here, $\sin 6$ means the sine of 6 radians (or degrees if specified, but usually radians). 3. The expression is a sum of $\sin 6$ and the product of $x$ and 9. 4. Since $\sin 6$ is a constant value and $x \cdot 9$ is a linear term in $x$, the expression cannot be simplified further without knowing the value of $x$. 5. So the simplified form is $\sin 6 + 9x$.