What happened in Europe in the 1800s?
A. The Europeans discovered the new world.
B. Europe became very industrialized.
C. The first European nations started to colonize other places.
D. The Europeans entered a trade war with the Middle East.

B. to study the spatial patterning of forests and forests fires and plan for better use of fire fighting resources in the u.s.

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].