Chemotherapy is a process of controlled poisoning. Application of chemotherapy slows cell division and increases the rate of apoptosis (cell death). Unfortunately, chemotherapy impacts all cells not just cancerous ones. So the goal is to nd the optimal amount of chemo that kills the most cancer cells with the lowest level of chemo. Liu and Crowford (2018) studied the rate of cell division (M0)), the rate of cell death (,LL(C)), and total cell counts (N(c)) as a function of the log concentration of chemo c, 10