A Mighty Girl
Gladys West
Teens might find it hard to imagine life before GPS. Using global positioning systems, they can quickly locate the nearest gas station, fast food establishment, or the home of a new friend. Introduce them to Gladys West, the lady who...
University of Nebraska
Rectangular Coordinates in 3 D
Advanced discussion of the components of a vector on a three dimensional plane is available here along with formulas and properties.