Y2 - 100 someone me with this

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

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

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76