This is my homework and i'm having some i know it looks easy but i can't decide what the answer is plz .

During the late 19th century, russia's settlement and development of siberia was made possible by the invention of the

In a small, closed economy, national income (gdp) is $350 million for the current year. individuals have spent $100 million on the consumption of goods and services. they have paid a total of $60 million in taxes and the government has spent $75 million on goods and services this year. use this information and the national income identity to answer the questions. how much does the economy spend on investment?

How does sociology account for the cause of drug and alcohol addiction?