Final answer:
The equation that relates the daily income I to the number n of customers at TTF, where the standard charge is $25 per customer, is I = 25n.
Step-by-step explanation:
The student's question asks for an equation that relates the daily income I to the number n of customers at TTF, where the standard charge per customer is $25. To find this equation, we can use a simple linear relationship, since the income increases by a fixed amount for each additional customer. The equation to represent this is I = 25n, where I is the daily income and n is the number of customers.
In this equation, the coefficient 25 represents the fixed charge per customer, and n is the variable representing the number of customers. Since there is no initial charge or additional fees, there is no constant or y-intercept in this particular linear equation. This formula can be used to calculate the daily income for any given number of customers by simply multiplying the number of customers by 25.