Your team works for the Silver Satellite & Cable TV Company in the Research & Development De-
partment. You've been asked to come up with a formula to determine the cost of running cable from
a connection box to a new cable household. The first example you are working with involves the
Stevens family who own a rural home with a driveway two miles long extending to the house from
a nearby highway. The nearest connection box is along the highway but 5 miles from the driveway.

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?