Describe the tone roach uses as she writes about "yucky" foods

Roach's tone is playful and conversational. Although her piece is very informative, it does not come across as cut-and-dry facts, but rather is enjoyable to read. For example, when Roach lists the apparently "yucky" food she's already eaten, she pokes fun at herself, saying "I am, yes, one of those annoying travelers who boast about the disgusting food they've lived to tell about." This self-awareness makes Roach seem like she is speaking directly to you, and makes you want to continue having a conversation with her. 

The slope of a linear equation is equal to the change in the value of the dependent variable divided by the change in the value of the independent variable. in this problem, the dependent variable is the profit while the independent variable is the worker's average pay. if the profit is said to increase by 1500 when worker's average pay decrease by 450, the slope is equal to 1500/(-450)=-3.33