21. Refer to Exhibit 1-1. If the student whose study habits are illustrated here is currently studying for the 8th hour, she should

They increased the hours of how she is studying because it benefits the studying of 2 hours, and is better of the other marginal  and the cost of doing so.

a. he allowed the people he conquered to keep their customs and religions.

he captured babylon and freed the jewish people to return to judah.

answer; necessity-driven;