If a+b+c+d=20 and a^2+b^2+c^2+d^2=108 then the variance of the data is? A)4
B)2
C)7
D)7/2

Evaluate 4 a for a = 5 2/3 . express your answer in simplest form.

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.

What are the solutions of the system? y = x^2 + 2x +3y = 4x - 2a. (-1, -6) and (-3, -14)b. (-1, 10) and (3, -6)c. no solutiond. (-1, -6) and (3, 10)