What is the longest mountain chain in the world? how wide is it? in what country is its highest peak?

It is the Andes Mountain Range. It covers the west coast of South America.

It's 4300 miles long and 310 miles wide.

Its highest point is Aconcagua which is in Argentina.

Ibelieve it is the 2nd answer, create gardens on all rooftops. let me know if this .

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].