Chemical substance has a decay rate of 9.2% per day. The rate of change of an amount N of the chemical after t days is given by StartFraction dN Over dt EndFraction equals minus0.092N. a) Let Upper N 0 represent the amount of the substance present at tequals0. Find the exponential function that models the decay. b) Suppose that 600 g of the substance is present at tequals0. How much will remain after 6 days? c) What is the rate of change of the amount of the substance after 6 days? d) After how many days will half of the original 600 g of the substance remain?