Final answer:
To convert 3.5 gallons to milliliters, you need to multiply 3.5 by the conversion factors: 3.786 to convert gallons to liters, and 1000 to convert liters to milliliters. The result is 13261 milliliters.
Step-by-step explanation:
To convert 3.5 gallons to milliliters, we need to use the conversion factors given. First, we know that 1 gallon is equal to 3.786 liters. So, to convert 3.5 gallons to liters, we can multiply 3.5 by 3.786 which gives us 13.261 liters.
Next, we know that 1 liter is equal to 1000 milliliters. So, to convert 13.261 liters to milliliters, we can multiply 13.261 by 1000 which gives us 13261 milliliters.
Therefore, 3.5 gallons is equal to 13261 milliliters.