When a factory operates from 6 AM to 6 PM, its total fuel consumption varies according to the formula ? (?) = 0.9?² ? 0.2?^0.5 + 11, where ? is the time in hours after 6 AM and ? (?) is the number of barrels of fuel oil.

Step 1. How much fuel is consumed by 3 AM? Round your answer to 2 decimal places. Answer: barrels Step 2. What is the rate of consumption of fuel at 9 AM? Hound your answer to 2 decimal places. Answer: barrels per hour Step 3. What is the average rate of consumption from 6 AM to 2 PM? Hound your answer to 2 decimal places. Answer: barrels per hour