Write in vertex form:
y = x2 - 4x - 1

What is the sum of these mixed numbers 4 2/3+ 3 1/9

Hundred and tens tables to make 430 in five different ways

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.