It is very difficult to generalize about Sub-Sharan African countries because environments, political systems, and ethnic groups are so diverse; thus, it is often the subject of misrepresentation and unwarranted, often negative, generalizations.

a. True
b. False

a. True

Explanation:

The countries the sub-Saharan Africa are those that have the high rates of the position density and those that have experimented the rapid rise of population is due to the high fertility rates and the rising the process of the commodities and such as the cold and oil is getting more and more expensive as the rose of the inflation in the economy.

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].