Martin Company purchases a machine at the beginning of the year at a cost of $66,000. The machine is depreciated using the double-declining-balance method. The machine's useful life is estimated to be 4 years with a $5,500 salvage value. The
machine's book value at the end of year 3 is:

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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