From 1870 to 1915, how many immigrants came to north america?

100,000

3 million

20 million

35 million

The correct answer is "20 million".

Explanation:

1870 to 1915 was a period of exponential growth of North America economy, particularly from United States industrialization and urbanization. This attracted millions of people around the world looking for a better life following the Civil War. It is estimated that around 20 million people migrated to the United States, the majority from Southern, Eastern and Central Europe, but by 1907 many people from Japan settle in large cities of America. It is estimated that by 1910, three-quarters of New York City’s population were new immigrants and first-generation Americans.

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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