Which of the following is a statistical measure of both the direction and the strength of a relationship between two variables

What was one step that charlemagne took to unite his kingdom? a. he chose a single strong heir to inherit his throne. b. he drove muslim forces out of europe. c. he created and supported schools. d. he declared himself head of the catholic church.

According to the aztec history, how did the aztecs know where to build their new city of tenochtitlan? why was this a good location?

Which are components pf a political party? why do we need political parties give reason.