(3x+20) (5x-16) find the value of x

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)

Ill mark the brainliest if you me with the these three questions 7,8,9

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