PLEASE ANSWER THIS QUESTION RIGHT Elize is scuba diving and plans to Leah Shirley ascend to the surface. Her depth In feet D(t) and her time in minutes T to reach the surface are represented by the table below. What is an appropriate domain for the situation?

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?