Give the domain and range. 21
3
-3
3 x
a. domain: {-3, 0, 2), range: {3, 0, -2}
b. domain: {3, 0, 2), range: {3, 0, 2}
c. domain:{-3, 0, -2}, range: (-3, 0, -2}
d. domain: {-2, 0,3}, range: {2,0,–3}

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?