4. 4 the creation of independent city-states in ancient greece can be most directly attributed to the

The biggest reason why ancient Greece never chose a single King, and  was dominated by smaller city-states instead, are the geographic features of the land where these cities were settled. The mountainous terrain, the isolation of the valleys, and the number of isolated islands would make it difficult for one person to govern it all. 

Also, Greeks were famous for their aristocracy that prevented the forming of monarchies. Political independence of the city-states was constantly protected by the aristocracy and so, any individual who would want to conquer the territory would succeed for only a short time and would never have the glory and respect of a real king.

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].