An anti-asthmatic drug has a half-life of about 9 hours. This means that 9 hours is the length of time it takes for the amount of drug present in a person's blood to decrease to half that amount.
a. Explain what this means about the amount of this drug in a person's bloodstream that starts out with a drug concentration of 16 mg/L.
b. Create a graph of points in the form (elapsed time, drug concentration) using 9-hour increments on the time axis.
c. What dosage of this drug should a person take every 9 hours to maintain a balance of at least 16 mg/L?