The system for graphing coordinates is called a ____________________

The x-coordinate is also known as the ____________

These are axes of a two-dimensional Cartesian system that divide the plane into four infinite regions, each bounded by two half-axes.

Which quadrant does (-3, -5) belong to?

 Francis and Charles are standing in line with 100 people. Francis is the 50th and Charles is the 51st person in the line. What is the distance between Francis and Charles if 20 people left the line from the back and each position in the line is 1 unit away from each other?