On average, a commercial airplane burns about 3.9 × 10³ ml of gasoline per second. there can be as many as 5.1 × 10³ airplanes in the air in the united states at any given time.
about how many milliliters of gasoline are burned per minute by commercial airplanes in flight in the united states?
1.2 * 10^? ml

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