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# Part 3: Suppose the field has a length of 6,000 feet. Sally

Part 3: Suppose the field has a length of 6,000 feet. Sally buys fencing to enclose it, but has bought 4 feet too much. Rather than throwing away the extra fencing, Sally enclose a slightly larger field by enlarging each side of the field by the same amount, so the fencing encloses the field and a border: What is the largest animal that could be at point X and be entirely within the border region, touching neither the fence nor the field? a)an ant b)a mouse c)a cat d)a cow e)an elephant Part 4: Give the average rate of change of the perimeter, if the length increases from 6,000 feet to 7,000 feet:_________

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