Suggest a mechanism that is consistent with a second order rate law

A + B---> AB

you have to reactants. so the rate law could be r=k [A] [B].. the order is 2 by adding the powers

To answer this problem, we multiply first the given figures above, 4.3x10^9.8  and 4.6 x10^7. the answer or the product of these figures is 19.8 x10^16.8. We add both exponents to get 16.8 and multiply both coefficents to get 19.8. The answer to this problem is A. 198x10^15.8