Select the law that corresponds to data shown for the following reaction 

$A+B\stackrel{ }{\to }$Products

Exp	[A]	[B]	Initial rate
1	0.012	0.035	0.1
2	0.024	0.070	0.8
3	0.024	0.035	0.1
4	0.012	0.070	0.8

From experiments (3) and (2), [A] is constant and [B] is double and rates becomes 8 times, so order w.r.t [B] = 3.
From experiments (1) and (3), [B] is constant and [A] is doubled, but rate does not change, so order w.r.t [A] = 0. Thus, rate $=k{\left[B\right]}^3$