Final answer:
The equation that represents the total cost, c, Vicky paid for the oranges is c = 312 * 3.90.
Step-by-step explanation:
The equation that represents the total cost, c, Vicky paid for the oranges is c = 312 * 3.90.
To find the total cost, you need to multiply the number of pounds of oranges, 312, by the cost per pound, $3.90. Multiplying these two values will give you the total cost of the oranges.
Therefore, the correct equation is c = 312 * 3.90.