For khan academy. Need answer immediately. Explain if you can . On the unit test

Two lines that do not intersect are skew. always sometimes or never

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.

What is always true about a positive integer raised to a negative odd power?