If the rate of excretion of a bio-chemical compound is given by f'(t) = 0.07 e-0.07t the total amount excreted by time t (in minutes) is f(t). Complete parts a and b a. Find an expression for f(t). b. If 0 units are excreted at timet=0, how many units are excreted in 45 minutes? (Round your answer to three decimal places).

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