What is the change in the scale factor from the old scale to the new scale? Old 1 in. =3.311 New 1in =111t

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?

Pls yall i really need the answer fr fr

Solve 17= -13 - 8x and show your work.