Final answer:
To determine the amount of money the student will have left after d days, we need to subtract the total cost of the plate lunches from the amount of money the student receives each week. The equation to determine the amount of money left, m, is m = $15.00 - $2.20d.
Step-by-step explanation:
To determine the amount of money the student will have left after d days, we need to subtract the total cost of the plate lunches from the amount of money the student receives each week.
Let m be the amount of money left after d days.
The cafeteria charges $2.20 for a plate lunch, so the student spends $2.20 per day on lunch.
Therefore, the equation to determine m is: m = $15.00 - $2.20d.