A chemical substance has a decay rate of 6.9% per day. The rate of change of an amount N of the chemical after t dN days is given by = -0.069N. 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? a) N(t) = b) After 2 days, g will remain.

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