Question: The energy expended by a bird per day, E, depends on the time spent foraging for food per day, F hours. Foraging for a shorter
The energy expended by a bird per day, E, depends on the time spent foraging for food per day, F hours. Foraging for a shorter time requires better territory, which then requires more energy for its defense. Find the foraging time that minimizes energy expenditure if

E = 0.25 F + 1.7 F2
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