Step-by-step explanation:
a)
Looking at the graph, it is reasonable to assume that after 3 hours, the concentration should be about 1.5 miligrams per liter.
b)
Answer: Concentration = 1.5 miligrams per liter after three hours.
c)
The function is given by a term in the numerator and a term in the denominator. The term in the denominator cannot equal 0.
Answer: The horizontal asymptote is the line y = 0