ON A chemical substance has a decay rate of 7 4% per day. The rate of change of an amount N of the chemical after t days is given by =-0.074N dt a) Let No represent the amount of the substance present at t=0. Find the exponential function that models the decay b) Suppose that 700 g of the substance is present at t=0. How much will remain after 2 days? c) What is the rate of change of the amount of the substance after 2 days? d) After how many days will half of the original 700 g of the substance remain? at kay

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