For the following expression, blank is an excluded value. `(2x)/(x+7)+(3x+1)/(x+7)=1/2`

Can someone me with my hwplz(only the circled ones)

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem

Which image (a’ b’ c’ d’) of abcd cannot he produced using only reflections ?