Find the value of X
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Which of the following of the following sets of side lengths could not form a triangle?

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.