Express the terms of the following sequence by giving an explicit formula. -1/2,-1 1/2, -21/2, -3 1/2,.. A. an = 1/2 - n, where n = 1, 2, 3, 4, ...
B. an = 2n, where n = 1, 2, 3, 4, ..
C. an = 1/2 - 2n, where n = 1, 2, 3, 4, ...
D. an = 1/2n , where n = 1, 2, 3, 4, ...​

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