Answer:
Let's say that the total cost of the classes is C and the number of classes is n. We can assume that each class costs the same amount, which we'll call p.
Then, the total cost of the classes can be expressed as:
C = np
However, Gregory charges a one-time processing fee of $3.00, so the total cost of the classes (including the processing fee) can be expressed as:
C = np + 3
Therefore, the equation that represents the relationship between the total cost of the classes (including the processing fee) and the number of classes is:
C = np + 3