(Solved): Find each of the following products. (a) \[ \begin{array}{c} {\left[\begin{array}{ll} 1 & 3 \end{ar ...

Find each of the following products. (a) \[ \begin{array}{c} {\left[\begin{array}{ll} 1 & 3 \end{array}\right]\left[\begin{array}{r} 2 \\ -1 \end{array}\right]=} \\ {\left[\begin{array}{l} {[} \end{array}\right]=} \end{array} \] (b) \[ \begin{array}{l} {\left[\begin{array}{lll} 7 & -1 & 8 \end{array}\right]\left[\begin{array}{r} 6 \\ 0 \\ -2 \end{array}\right]=} \\ {[] \Rightarrow} \\ \end{array} \]