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18) A lawn maintenance company treated a customer's lawn with insecticide

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18) A lawn maintenance company treated a customer's lawn with insecticide. Suppose the number of surviving insects (A) is given by the function, Alt) = —l.'3 +5t+750 in hundreds, at t hours. GD (a) Find the rate of change of the number of living insects at 4 hours. (b) How many insects were in the lawn before it was treated with insecticide?