What is the name of the native american civilization established in chaco canyon and mesa verde before the advent of spanish empire?

 The Anasazi

The name "Anasazi" means "ancient outsiders."  Later explorers of the regions also referred to them as "Cliff Dwellers."  Around 1500 BC, the Anasazi arose as a thriving civilization in what is now the American southwest.  The Anasazi built dwellings underneath cliffs so that they'd be sheltered.  They used sandstone blocks and mortar made from mud to build lasting structures.  The Pueblo Indian tribes are descended from the Anasazi civilization.

i beleive its 1)aids

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".