Trevor is scratching his head, trying desperately to solve a verbal analogy as part of a standardized entrance examination; Sienna, meanwhile, is giving an oral presentation in a political science class. Of the brain's hemispheres, Trevor's hemisphere is most active; Sienna's hemisphere is most active.

Left; left

Explanation:

The Left hemisphere of the brain is responsible for performing task that relates to logic such as mathematics, science and technology. Both Trevor and Sienna are engaging the left hemisphere of the brain as the task they are engaged in is performed by the left hemisphere of the brain.

responsibilities im assuming

answer; shays rebellion;