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The first sail has one side of length 9 feet and another of length 6 feet. Determine the range of possible lengths of the third side of the sail.

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first find the greatest possible length:

9 + 6 > x

15 > x

x < 15

Then find the lowest possible length:

x + 6 > 9

x > 9 - 6

x > 3

3 < x < 15

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