How are the answers to problems 6,8,12, and 14 similar?how are they different?

In trapezoid klmn, kj=19.2 and jm=22.5. identify ln.

Simplify the expression. -2/5(10+15m-20n)

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