The size, S, of a tumor (in cubic millimeters) is given by S = 3^t , where t is the number of months since the tumor was discovered. Give units with your answers. a) What is the total change in the size of the tumor during the first five months? (include units)

b) What is the average rate of change in the size of the tumor during the first five months? (round to one decimal place and include units)

c)Estimate the rate at which the tumor is growing at . (Use smaller and smaller intervals.)