Will some help with this math?

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.

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?