Final answer:
Without further information, it is difficult to determine how much each notch down on the Telma is in mathematics.
Step-by-step explanation:
On the Telma, every notch down reduces the value by a certain amount. However, without further information about what the Telma is, it is difficult to determine the exact amount. In mathematics, the term 'notch' is not commonly used to represent a specific value. It would be helpful to know the context in which the Telma is being used in order to provide a more accurate answer.