What do you understand by exothermic reaction? In a particular reaction it was observed that, reactant A and B are react

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What do you understand by exothermic reaction? In a particular
reaction it was observed that, reactant A and B are reacting to
produce C. But after calculation it was found that the reaction
rate shifted from 0.0129363 mol L-1 s-1 to 0.0915 mol L-1 S-1 when
the concentration of B was changed from 0.223 (M) to 0.669 (M).
What was the order and rate constant of the reaction? Find
mathematically. You must show your working steps.