Which expression shows the distance on the number line between -12 and -1? o 1-12-11
01-12 +(-1)]
1-1 - 12
o 1-12 – (-1)

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?