The number of people infected by a virus as a function of time since the fever was detected, N(t) = 300t^3 - 20t^2, for 0<=t<=60.
a. How many people infected after 10 days?
b. What is the average rate of spread between t=10&t=30 days?
c. What is the rate of spread at t=20 days?
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I don't understand...........
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