(d) X(-12) = 132
help me with equations ​

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

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