Fluorescent light flickers as it is about to blow and the light cycle can be approximated by a sinusoidal curve. A model for one fluorescent light is y = 35 + 15sin120π(x -0.003), where x is the amount of time in minutes. How long does it take for the light to flicker five times?

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?