How did Charlemagne expand his empire? Choose three correct answers. He unified the empire under one religion.
He used military strength to conquer lands.
He had monasteries built throughout the empire.
He became the pope of the Roman Catholic Church.
He allowed people to follow any religion they wanted.

Dr. robbins wants to know if there are different opinions regarding the value of public school education between native americans who have at least one relative who attended indian boarding school and native americans who have no family experience with indian boarding school. dr. robbins contacts 35 native american participants in each group. he wants each group to include younger as well as older adults, and a mix of male and female participants. he asks each person to complete a survey about their attitudes toward public education. the design of this study is: