I need help please!!

Landon wrote that 3−2.6=4. which statement about his answer is true?

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).

Nina has prepared the following two-column proof below. she is given that ∠oln ≅ ∠lno and she is trying to prove that ol ≅ on. triangle oln, where angle oln is congruent to angle lno nina made two errors in the proof. identify and correct the errors.