When a factory operates from 6 AM to 6 PM, its total fuel consumption varies according to the formula f(t) = 0.5t - 0.21t^0.4+ 13,

When a factory operates from 6 AM to 6 PM, its total fuel consumption varies according to the formula f(t) = 0.5t² - 0.21t^0.4+ 13, 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 11 AM? Round your answer to 2 decimal places.