Mathematics, 25.02.2020 23:18 yere144k

Can someone explain this please?

A technician can test video player chips at the rate of -3t^2 +16t+5 chips per hour (for≤0 ≤t ≤6), where t is the number of hours after 9:00 am. How many chips can be tested between 11:00 am to 3:00 p. m.? (assume t=0 for 9:00 a. m.)

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