What is the measure of abc and show me how to do it

If you are just building your payment history, how many points from a perfect score will you possibly miss?

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.

How many solutions does the nonlinear system of equations graphed below have?