The number of heart transplants, y, performed in the U.S is given by Y= 55x + 2157, where x represents the number of years after 2001.
a) According to this model, how many heart transplants were performed in the U.S in 2001?
b) According to this model, how many heart transplants can be expected in the U.S in 2020?
c) According to this model, in what year will there first be more than 5000 heart transplants performed in the U.S?
d) Explain in one or two sentences what the slope means in the context of this problem.