5.
0.09x2 + 0.42xy + 0.16y? -0.05x2
0.7x + 0.8y-0.5x -0.4y
= ?
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Answer:
0.09x2 + 0.42xy + 0.16y? -0.05x2
0.7x + 0.8y-0.5x -0.4y
= 200
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