Solve inequalities: 2 less than or equal to 2x-4 less than or equal to 10

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

Given abcd ac=38 and ae=3x+4 find the value of x

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