Which expressions are equivalent to this expression?

y+y+y+3z

Select each correct answer.

3(y+z)

2y + 2z + y + z

3y + z

3 + y + 3z

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

How do you solving the solution of each system using elimination?

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