Which statements about the graph of the function f(x) = -x2 - 4x + 2 are true? Select three options.
The domain is {XIX S-2}.
The range is bly s 6).
The function is increasing over the interval (-00, -2).
The function is decreasing over the interval (-4,00).
The function has a positive y-intercept.

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?