The rectangle abcd is centered at the origin. c has the coordinates (w-v). determine the coordinates of a, b, and d.
a. al-w, -v), b(-w, v), d(w, v)
b. al-w,-v), b(w, v), d(-w, v)
c. a(w, v), b(-w,-v), d(-w,-1)
d. a(-w, v), b(w, v), d(-w,-v)

Answer this question only if you know the answer! 30 points and

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?

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