Solve by factoring 3x^2 -19x -40 = 0

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

If abcde is reflected over the x-axis and then translated 3 units left, what are the new coordinates d?

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?