SLOPE AGAIN HEE HEE PLEASE HELP ME! + 50 WHOLE POINTS THERE ARE 3 question PLZ ANSWER ALL OF THEM IK IT is a lot ikikik but i will give brainliest thanks 5 stars AND FIFTY POINTS I REALLY NEED HELP

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 private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.

In the diagram of circle o, what is the measure of zabc?