1. What name is given to the greatest economic crisis in US history?

Great depression

Explanation:

The great depression is a name given to economical crisis, that started in 1929 and ended in 1933. It all started with Wall Street crash  and ended with Roosevelt's New Deal. During this period millions lost their job, economy of United States was at its lowest stage, and the crisis spread on Europe.

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".

gpd hope this

~blake