When a factory operates from 6 AM to 6 PM, its total fuel consumption varies according to the formula f (t) = 0.61² – 0.3tº.3 + 21, where t is the time in hours after 6 AM and f(t) is the number of barrels of fuel oil. Step 1 of 3: How much fuel is consumed by 1 PM? Round your answer to 2 decimal places.

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