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The traffic flow rate (cars per hour) across an intersection is 7(t) - 500 +1000t - 270, where t is in hours, and t=0 is

The traffic flow rate (cars per hour) across an intersection is 7(t) - 500 +1000t - 270, where t is in hours, and t=0 is 6am. How many cars pass through the intersection between 6 am and 9 am? cars

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