The following two-column proof with missing justification proves the Pythagorean theorem using similar triangles which is not a justification for the proof

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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.

Simplify 24÷(-2)(3)+7 a. -29 b. 3 c. 11