3. What is the crucial factor for a sample selection to be random?

The equation respenting the left table is

Given: hf || jk; hg ? jg prove: fhg ? kjg to prove that the triangles are congruent by asa, which statement and reason could be used as part of the proof? fgh ? kgj because vertical angles are congruent. jkg ? hfg because vertical angles are congruent. fhg ? jkg because right angles are congruent. hfg ? kjg because alternate interior angles are congruent.

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)