Aplane that carries mail makes a round trip each day from chicago to new york. it makes 2 intermediate stops on the way to new york and 1 intermediate stop on the way back to chicago. suppose you make a graph of the altitude of the plane for one day, with time on the horizontal axis and altitude on the vertical axis. how many times will the graph touch the horizontal axis?

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