Arnold, the heat-seeking mussel, is the world’s smartest mollusk. Arnold likes to stay warm, and by using the crustacean coordinate system he learned from a passing crab, he has determined that at each nearby point (x, y) on the ocean floor the temperature (ºC) is T(x, y) = 2x² − xy + y² − 2y + 1 Arnold’s world consists of a rectangular portion of ocean bed with vertices (−1, −1), (−1, 1), (1, −1), and (1, 1), and since it is very hard for him to move, he plans to stay where he is as long as the average temperature of this region is at least 5°C. Does Arnold move or stay put?

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(-1, 1) (-1,-1) (1, 1) (1, -1)