If the rate of excretion of a bio-chemical compound is given by f(t)=0.06e0.06t the total amount excreted by time t (in minutes) is f(t) a. Find an expression for f(t) b. If 0 units are excreted at time t=0, how many units are excreted in 13 minutes? a. Find an expression for f(t) f(1)= b. If 0 units are excreted at time t=0, how many units are oxcreted in 13 minutes? urit(s) (Type an integor or decimal rounded to the noarest three decimal places as needed)