What does the author of "the expert" mean when he says that katie is "all business"?

To say someone is "all business" means that the person is very serious.  They take the job or task at hand and would to complete it to the best of their ability.  "All business" means very little joking around, taking responsibility for their actions, and fixing problems.  

the rhetorical devices that he used in "common sense" are syntax for his sentence structure and pathos for his emotion against the british unfairly treating the "americans" and logos of what documents that what happened to the pilgrims when they had the mayflower compact and how that the british were wanting to have one religion but the compact said for any religion to be accepted.