Give an example of how ethnologists helped archaeologists determine how something was used.

here you go :)

Explanation:

In many sites in the Southwest, prehistoric sites often contained large underground circular rooms. Archaeologists did not know how the rooms were used. By observing modern use of kivas, ethnologists and archaeologists could understand the religious significance of the underground circular rooms.

part a. there were 250 teenagers surveyed (100% of tenagers = 250)therefore 1 % = 250/100 = 2.5 76% = 1% x 76 = 2.5 x 76 = 190 teenagers of the 250 surveyed liked burgerspart b: jane surveyed 25% (which is equal to 50 teenagers, i.e. a quarter of the teenagers surveyed is 50) to get 100% we simply get 4 quarters, i.e. multiply 50 by 4 = 200 teenagers were surveyed by jane. part c: it is impossible to give an example where a percentage is greater than 100%, since, by definition , percentage means "per 100".