Que tipo de líder gobernó Grecia en el año 600

The soviet union and the united states believed in two very different economic systems. what were the names of each?

In ohio in 1872, the cleveland massacre was a)a violent labor dispute at standard oil refineries in cleveland. b)a takeover by standard oil of the refineries in cleveland. c)an attempt to stop standard oil from becoming a monopoly. d)a failed attempt by standard oil to take over other refineries.

31/3: which equation has the solutions x =?