Compounds A and $B$ react to produce compounds $C$ and $D$ according to the equation $A+BC+D.$ The rate law for this reaction is: rate $=k[A][B].$ The table below gives the initial concentrations of A and $B($in molarity$)$ used in four separate runs of the reaction at $65C,$ along with the initial rate of each reaction. Determine the average value of the rate constant, $k.$

$\backslash$table$[[$Run #$,\backslash$table$[[[A{]}_{\text{i}\text{n}\text{i}\text{t}\text{i}\text{a}\text{l}}$