How do you tell wether a parabola graph has 2 solutions

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

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Find the y-intercept and x-intercept for the equation 5x-3y=60 what is the y-intercept