An Atlanta school district wants to compare the effectiveness of a standard AP Statistics curriculum and a new "hands-on AP Statistics curriculum. Two experienced teachers, Mrs. Davis and Mr. Cohen, each teach one class with the standard curriculum and one with the new approach. Students are
assigned at random to these four classes. At the end of the year, all students take the AP Statistics exam. Which of the following are the experimental units
in this experiment?

You need to re ask the question with proper

Horizontal asymptote at  tells us that the original graph has been translated down.since  ,  are positive.  also we can say that the point  has a smaller  -coordinate than  .this means that the  transformed exponential function is increasing as it goes to the right. as it goes from  to , the value of the exponential function increases. it goes from to something bigger, . therefore, as  . the left hand would be the side that approaches the horizontal asymptote.so the answer is d