Find a positive angle less than 2pi that is coterminal with the given angle. 31pi/9

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height

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

Find the axis of symmerty for x y=x squared -4x-8