For the graph x = 12 find the slope of a line that is perpendicular to it and the slope of a line parallel to it.

What is the difference between regular convex and concave polygons

What properties allow transformation to be used as a problem solving tool

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?