What is the standard of review for questions of law and mixed fact and law?

This is an appeal from a decision of a court of first instance. Questions of law are to be reviewed on the correctness standard while questions of fact and mixed fact and law (apart from extricable errors of law) are to be reviewed on the standard of reasonableness: Housen v. Nikolaisen, 2002 SCC 33, [2002] 2 S.C.R. 235, at paragraphs 8, 10, and 36.