Final answer:
Corbin needs to pay a flat fee of $40 for his summer swimming lessons, which is option c. This fee is the total amount due for the lessons.
Step-by-step explanation:
Corbin needs to pay a flat fee of $40 for swimming lessons over the summer. Therefore, the correct answer is c. $40. No additional costs have been mentioned, so the total amount Corbin needs to pay for swimming lessons is solely the flat fee.
If we were to express the situation for a tutoring school that requires a one-time enrollment fee of $500, plus tuition of $3,000 per year, it could be represented as an equation like this: T = $500 + ($3,000 × Y), where T represents the total cost and Y represents the number of years of tuition.