What was the most daunting challenge of Charlemagne's reign of power?

When zhang qin went to explore west, he brought back stories of

"it is true that we are called a democracy, for the administration is in the hands of the many and not the few." pericles athenian statesman, 5th century b. c.e. what kind of democracy is pericles referring to? - pericles athenian statesman, 5th century b. c.e. a. representative democracy b. parliamentary democracy c. direct democracy d. presidential democracy

How many soultions does the system of equations have y= -6x + 330x + 5y = 15a. one b. twoc. infinity manyd. none