Please help, due in 6 hrs (will mark brainliest and giving 85 points) will ask seperate question for the 85 points

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

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

To decrease an amount by 16% what single multiplier would you use