De 1000 encuestados, 574 estudian Ingles, 726 Alemán y 250 no estudian ninguno de estos cursos. ¿Cuantos estudian los 2 cursos? POR FAVOR RAPIDO

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2