Factor a number, variable, or expression out of the polynomial shown below. 20x3 + 15x a. 10x(10x2 + 5x) b. 5x(4x2 + 3x) c. 5x(4x2 + 3) d. 10x(10x2 + 5)

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