The Cartesian Coordinate System was invented by Rene Descartes back on the 17th century. It uses a pair of perpendicular axis to measure the distance from the origin (where the axis meet) to an specific point on the plane.
It's the basis for the analytic geometry and also provides an excellent interpretation of many of the other disciplines of math via the graph of a function. It's also the most used system in astronomy, physics and engineering.
I think it was the prevention of terrorism act, sorry if wrong.
Answer: Your answer would be C, african americans.
Explanation: The Klan was a group of white citizens who targeted black businesses, neighborhoods, and houses. During the Tulsa Race Riot, the Klan destroyed greenwood, a very large black neighborhood. Hope this helps!
Happy studying,
-The WZRD
1. our government (democracy) is Greek (thats one thinking of others)
