Bloodstream Drug Concentrations

The following questions are about modelling drug concentrations in the blood over time. Questions A and B rely of the information in the table below:

Measurement Time Drug 1 Concentration Drug 2 Concentration
Initial Drug Administration 1.0 mg/ml 1.5 mg/ml
4 Hours after Administration 0.15 mg/m. 0.75 mg/ml

A. For this part assume that the function describing the concentration as as function of time is linear. Each data set in the above table represents a different drug and a different initial dose. For each set:

B. Now assume that the concentration of the drug in the blood decays exponentially. This model has been shown in clinical tests to be more realistic. For each set: