PART 1: Multiple Choice 1. The expression 16x? - 81 is equivalent to
(1) (8x - 9)(8x + 9)
(2) (8x - 9)(8x - 9)
(3) (4x - 9)(4x + 9)
(4) (4x - 9)(4x -9)

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