PLEASE HELP THIS IS A USA TEST PREP Which is the BEST explanation for why men like George Washington, Thomas Jefferson, and Benjamin Franklin are known as the "Founding Fathers"?

A) They played a major role in uniting the southern slave-holding states and the northern free states into one nation.

B) They were political leaders sent to the colonies by the King of England with the goal of founding a new, independent nation.

C) They were the three military leaders most responsible for surrounding and capturing British troops during the Battle of Yorktown in 1781.

D) They served as leaders in the American Revolutionary War and helped create the Declaration of Independence and the United States Constitution.

lincoln declared that slavery should not be allowed to spread into the new states, and of course this angered the south at the time.

1920 census

2010 census

the group i'm selecting: greeks.

a first group of greek immigrants came to the us in the 1850s. the second group came to america starting in the 1890s due to economic opportunities they didn't have back in their home caused by the hardships of ottoman rule. greek immigration was 90% male, many of them expected to work and return to greece after earning enough capital, but ultimately had to remain in the us after the greek genocide.

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