In how many of the given sentences has the underlined word 'mercurial' been used correctly? S1: His mercurial temperament made it difficult for his employees to know what to expect. S2: The mercurial properties of the liquid made it ideal for use in thermometers. S3: The athlete's mercurial speed allowed him to outrun the entire defense.

In the given sentence, identify the word that is contextually inappropriate (homophone error): The captain instructed the crew to adjust the sales to catch the morning breeze while navigating the strait.

In the following sentence, identify the word that is contextually incorrect and should be replaced: The economist explained that the noticeable affect of inflation was evident in the rising cost of living.