Find the minimum value of the objective function and where it occurs, subject to the constraints:
?
Objective function:
?
z = 4x + 16y
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Constraints:
?
x ? 0
y ? 0
x + 4y ? 20
x + y ? 18
?2x + 2y ? 21
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A. Minimum at 
: 
B. Minimum at 
: 
C. Minimum at (0, 0): 0
D. Minimum at 
: 80
E. No minimum
Answer: C
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?
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