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Medium

MCQ

The amount of gasoline stored at a fuel station is decreasing at a rate of r(t)r(t) liters per hour (where tt is the time in hours). What does ∫2021r(t)dt=−450\int_{20}^{21} r(t) d t=-450 mean?

Select all that apply :

During the 21st 21^{\text {st }} hour, the amount of gasoline at the fuel station decreased by 450 liters.

During the first 21 hours, the amount of gasoline at the fuel station decreased by 450 liters.

During the 20th 20^{\text {th }} hour, the amount of gasoline at the fuel station decreased by 450 liters.

During the first 20 hours, the amount of gasoline at the fuel station decreased by 450 liters.

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