I really need help with this question, and I would really appreciate it! I will mark brainliest!

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

What could explain what happened when the time was equal to 120 minutes

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