Which of the following waves allows us to see colors?

What greek scientist created a screw to move water for irrigation?

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?

Crime affects the economy which which two primary ways? a financially and monetarily b non-financially and industrially c microeconomic and macroeconomic d spiritually and emotionally