When a factory operates from 6 AM to 6 PM, Its total fuel consumptlon varies according to the formula f (t) = 1.1t-0.410.5 + 20, where t is the time In hours after 6 AM and f (t) is the number of barrels of fuel oil. Step 2 of 3: What is the rate of consumption of fuel at 9 AM? Round your answer to 2 decimal places. Answer 国 Keypad Keyboard Shortcuts barrels per hour

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