I am re-posting this question because i wrote the incorrect function last time.

An oil tank is being drained for cleaning. After t minutes there are v litres of oil left in the tank, where v(t)=35(25-t)^2, 0<=t<=25

a) determine the average rate of change of volume during the first 15 minutes

I got -1225 as my answer, is that correct?

b) determine the rate of change of volume at the time t=15 minutes

I'm not sure how to answer this.

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  1. v(0) = 35(25)^2 = 21875
    v(15) = 35(10)^2 = 3500

    avg rate of change for those 15 minutes
    = (2500 - 21875)/(15-0)
    = -18375/15 L/min
    = -1225 L/min

    You are correct

    at t=15, you are looking for the instantaneous rate of change, that is,
    the derivative of v(t)

    v ' (t) = 70(25-t) (-1)
    v ' (15) = -70(25-15) = -700 L/min

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