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.
Let's review. You want to use the quotient rule when you have one function divided by another function and you're taking the derivative of that, such as u / v. And you can remember the quotient rule by remembering this little jingle: Lo d hi minus hi d low, all over the square of what's below.