What does it mean when a guatemalan shakes his hand quickly so that the index and middle fingers slap together and make a snapping sound? he is trying to get a girl's attention. he is adding emphasis, expressing surprise, or indicating "hurry." he is showing affection. he is hungry?

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

Ineed because i cannot find the answers anywhere

The purpose of laws were to restrict the rights of african americans who lived in southern states. a) "jim crow" b) "civil rights" c) "anti prohibition" d) "reconstruction acts"