Consider the reaction a  ⟶productsuse the following rate data to determine the order of the reaction with respect to the reactant a.        [a] (m)                            initial rate (m/s)        0.10                    0.015        0.40                    0.0601032

The given reaction is A---> products

Trial-1: The initial concentration of A is 0.10 M when the initial rate is 0.015 M/s

Trial-2: The initial concentration of  A is 0.40 M when the initial rate is 0.060 M/s

Let the order be m

Rate law for first trial will be:

Rate law for second trial will be:  

Rate- 2/ Rate-1 :

So, m = 1

Therefore the order of the reaction is 1

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)