The number of diseased cells, d(t), remaining in a recovering patient's bloodstream t days after starting medication is given by the function below.(see image)
What is the average decrease per day in the number of cells in the patient's bloodstream from the 10th day to the 18th day?
A. 99.29 cells per day
B. 139.39 cells per day
C. 158.43 cells per day
D. 49.65 cells per day
