Where do people live in the northern countries of africa?
a) countryside
b) close to water

People in the northern countries of Africa live close to water.

Explanation:

The world's largest desert 'Sahara' has spread over most countries in the north of the African continent. This region is characterized by extreme scarcity of water. The population in these countries is concentrated only in places where there is the availability of water. Compared to the total area, the population in these countries is extremely scarce. Lack of vegetation and a hot, dry climate all throughout the year make living really tough.

Ithink it is space that makes up 70 percent

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].