10th grade LT2 question

In the diagram of circle a what is m

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

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.