As a preservatives, Glacial Acetic Acid can be used in a wide variety of industries including: food production, beverage, pharmaceutical, agriculture/animal feed, and various other industries.
The difference quotient is a measure of the average rate of change of the function over an interval (in this case, an interval of length h). The limit of the difference quotient (i.e., the derivative) is thus the instantaneous rate of change.
The word quotient is from the Latin 'quotiens', which means 'how many times'. A quotient is the answer to a division problem. A division problem describes 'how many times' a number will go into another. The first known usage of the word in mathematics is found around 1400-1500 AD in England.