The effectiveness of an anesthetic t minutes after entering the blood stream is given by: e(t) = 2/25 ( 5 + 3t + 3t^2 – t^3) (a)
find the average rate of change of the drug effectiveness between t = 1 and t = 4 (b) find the instantaneous rates of change of the drug effectiveness at time = 1 and at time = 4. in one sentence, interpret the meaning of this value.

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average rate of change between [1,4] = \[\left[ e(4) - e(1) \right] / \left[ 4 - 1 \right]\]

By using that, would i get -6/25 as my answer?

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