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10 < x < 15

If a triangle has shortest side x and longest side 15, then x must be greater than 10 (the sum of the two shortest sides of a triangle must always be greater than the largest). If 15 has to be the longest side, then x must be less than 15 (equaling 15 would make the triangle isosceles, not scalene). Therefore, any value for x between 10 and 15 satisfies the statement.

***note: If 5 and 15 were 2 sides of a sclane triangle and x could be greater than 15, then the correct answer would be

10 < x < 20

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15y ago

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