$\begin{array} {cccc}
\text{Experiment} & [A]\; \text{in M} & [B]\; \text{in M} & \text{Initial Rate in Ms}^{-1}\\
1 & 1 & 2 & 0.01\\
2 & 1 & 8 & 0.64\\
3 & 0.5 & 8 & 0.32\\
4 & 1 & 1 & 0.00125\\
\end{array}$
$\begin{array}{1 1}k[A]^3 [B]^3 \\ k[A][B]^3 \\ k[A]^3 [B] \\ k[A][B] \end{array}$