What is 5 1/4 divided by 2 2/7? a - 2 b - 12 c - 12 19/64 d - 2 19/64

What is the absolute value of the complex number -4-sqrt2i

What is the slope of the line that contains the points (-2,1) and (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?