When sailors from England came to Roanoke Island in 1590, they found that the colonists left there two years before had

Gold and Silver

Explanation:

i Searched it up and it said ”The Roanoke Colonies. The Roanoke Colonies were an ambitious attempt by England's Sir Walter Raleigh to establish a permanent North American settlement with the purpose of harassing Spanish shipping, mining for gold and silver, discovering a passage to the Pacific Ocean, and Christianizing the Indians”

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".

it increase by 12% a year from 1812-1820