The figure below shows the rate of change, r(t) in the quantity of gasoline contained in a fueling station storage tank, in gallons per hour, where t is the number of hours since 7:00 am. The storage tank had 9000 gallons of fuel at 7:00 am. Calculate the amount of fuel in the tank at 3pm.

1400 gallons.

7600 gallons.

2800 gallons.

10400 gallons.

3400 gallons.

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