A rectangular building is 60' long and 36' wide. The four exterior walls have a sill-to-top-plate distance of 8 1/2'. How many 4x8 sheets of plywood would be needed to cover the four exterior walls of this building. (Round up to the number of sheets needed to the next full sheet. Do not allow for waste.)

a. 49

b. 47

c. 51

d. 45

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