function or no function? Pls don't spam I really need help.

Anyone know? is appreciated! will mark brainliest if correct!

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

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