Arational expression simplifies to 1/2. the denominator of the original expression is given. which polynomial is the numerator? ? 6x^2-2x-8 a) 6x^2-2x-16 b) 3x-4 c) 12x^2-4x-16 d) 3x^2-x-4

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?