George is giving two speeches at school. the first was 3.4 minutes long. then he added 0.9 minutes to the speech. the second speech was 4.1 minutes long . then he subtracted 1.4 minutes from it. use the benchmark to estimate the length of each speech

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