What is the volume ?? Please I need help

What term best describes a line ans a point that lie in the same plane

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?

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.