After t months on the job, a postal clerk can sort q(t)=700−410 e−0.5t letters per hour. what is the average rate at which he clerk sorts mail during the first 4 months on the job?

645 letters per hour

Step-by-step explanation:

Given : After t months on the job, a postal clerk can sort letters per hour.

Then the average rate at which he clerk sorts mail during the first 4 months on the job, we put t= 4 , we get

Hence, the average rate at which he clerk sorts mail during the first 4 months on the job = 645 letters per hour