A boy and his friend are driving go-karts on two different tracks. As the boy drives on a straight section heading east, his friend passes above him on a straight section heading south. Are these sections of the two tracks parallel, skew, or neither? Explain.

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?