What ways could a criminologist observe a teenage gang from the outside?

Decribe all the number that when rounded to the nearest thousand are 645.000

What makes water a renewable source

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?