Many physical processes are exponential in nature. A typical way of cleaning a tank of contaminated water is to run in clean water at a constant rate, stir, and let the mixture run out at the same rate. Suppose there are initially 100 pounds of a contaminant in a large tank of water. Assume that the cleaning method described above removes 10% of the remaining contamination each hour. A. What is the exponential formula that gives the number of pounds of contaminant left in the tank after t hours? B The amount of contaminant removed during the first three hours is pounds removed. Answer to one decimal place. C. The amount of contaminant removed during the 10th (t=10) hour is pounds. Answer to one decimal place. D. The amount of contaminant removed during the 13th (t= 13) hour is pounds. Answer to one decimal place. E. The amount of contaminant removed from the tenth (t=10) to the thirteenth (t=13) hour of the cleaning process is pounds