I need an explanation on how to solve this.

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.

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

Solve the formula ax+ by = c for x.