What are some treaties america broke

An education expert is researching teaching methods and wishes to interview teachers from a particular school district. she randomly selects ten schools from the district and interviews all of the teachers at the selected schools. which type of sample did she use in this study? a)systematic sample b)probability sample c)stratified sample d)cluster sample

Although the ideas of ren and li were originally buddhist principles, confucius adopted them as his own and they eventually became the center of confucian philosophy. select the best answer from the choices provided true or false

Calculate the iq of a 20 year old who has the mental age of 25