According to the Rational Root Theorem, what are all the potential rational roots of f(x) = 9X4 - 2x2 – 3x + 4? O +g.+g.+3, +g.+3, +1, +3, +2, +4 4, 1 0 ++3+ +1, +9+4+3, +2, +9 O 1 2 1 4 2 4 9.9. 3.9. 3. 1, 3, 2, 4 1 1 3 3 9 4.7.4, 1, 2,4 9 3. 2. 9

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?