Use the properties of logarithms to evaluate each of the following expressions. \( \begin{array}{l}\text { (a) } 7 \ln e^{3}-\ln e^{8}=\square \\ \text { (b) } \log _{6} 4+\log _{6} 9=\square\end{array} \)

\( 1 \leftarrow \quad \begin{array}{l}\text { Write the first four terms of the recursive sequence. } \\ a_{1}=6, a_{n}=5-a_{n-1} \text { for } n \geq 2\end{array} \) \( a_{1}=\square \) (Type an integer or a simplified fraction.)

Question simplify: \( \sqrt[6]{x^{18}} \)

Question simplify: \( \sqrt{\frac{294}{6}} \)

Question Simplify: \( \sqrt{9+16} \) (Enter \( \varnothing \) if your answer is not a real number.)

Question simplify \( \sqrt[3]{-128} \). Express the answer using a positive radicand.