What river cuts through seven european countries including germany, austria, hungary, serbia, and romania

The most common economic system in the world is aclosed economy.command economy.mixed market economy.traditional economy.

Where is the world’s shortest commercial runway?

What is the radius of a circle whose equation is (x + 5)^2 + (y – 3)^2 = 42? 1. 2 units 2. 4 units 3 .8 units 4. 16 units