How we differentiate a pseudo unilateral cross bite from true asymmetry?

When evaluation the lower third proportion, what should we see in a normo-divergent patient?

According to Proffit, the gingival margin on the maxillary lateral incisor should be 1.5mm lower than the central incisors and canines. That follows the concept of LOW-HIGH-LOW.

What is the most frequent etiologic factor for unilateral posterior lingual cross bite?

Let , , and  be 

Let  and  be 

Which of the following sets are subspaces of ? (1) 

Fin the reduced row echelon matrix that is row equivalent to the following matrix: 

For what values of  and  does the following system have infinitely many solutions? 

Which of the following sets of vectors is linearly independent?