A rectangle is placed around a semicircle as shown below. The width of the rectangle is 3 mm . Find the area of the shaded region. Use the value 3.14 , and do not round your answer. Be sure to include the correct unit in your answer.

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?