Please help. I am doing a test and I do not understand what I am being asked.

Find the nonpermissible replacement for binthis expression.b2/5b +5

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.

Can anyone me get through my algebra 2 class? the only class i need to graduate..