Modeling with Rational Functions Answers

A medication is administered to a patient and the concentration of the medication in the bloodstream is monitored. At time (in hours since giving the medication) the concentration, in mg/L, is modeled by the graph of the rational function on the right. Approximately when does the medication reach half of its highest concentration in the patient’s bloodstream?1 hour1 hour, 15 minutes3 hours3 hours, 45 minutes

Why does it make sense in this situation that the function has this horizontal asymptote?The average cost per person is always greater than $630 because of the fee for the tour guide.The average cost per person is always less than $630 as long as more than one person goes on the vacation.The average cost per person equals $630 after a certain number of people go on vacation.

If the volume of the gas increases from 600 to 800 in.3, by how much does the pressure change?