The hierarchical listing of settlements by size is known as the

The answer is:

              Rank-size rule

Explanation:

Rank-size rule is a commonly observed statistical relationship between the population sizes and population ranks of a nation’s cities.

According to the rank-size rule, there should be a larger number of small cities than bigger cities. Also, this rule predicts that the larger a city’s population is then the fewer number of cities there should be in the surrounding area with a similar population.

the idealization of the rural landscape ; admiration for the beauty of nature ; focus on an individual's inner concerns

the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69