Provide an appropriate answer.Find 
when r = 2 and s = 1 if w(x, y, z) = xz + y^2, x = 3r + 3, y = r + s, and z = r - s.
A. 
= 14
B. 
= 18
C. 
= 3
D. 
= 12
Answer: B
Mathematics
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