Final answer:
The maximum fuel quantity, including unusable, is approximately 1874 pounds.
Step-by-step explanation:
The maximum fuel quantity, including unusable, is determined by the given mass of fuel. According to the information provided, the total fuel mass is 850 kg. Therefore, the maximum fuel quantity in pounds would be the conversion of 850 kg to pounds. Since 1 kg is approximately 2.205 pounds, the maximum fuel quantity would be approximately 1874 pounds.