The function follows an exponential function. The domain is all numbers greater than or equal to zero, the same is true for the range. It would be hard to predict future points on the graph due to the fact that sales have decreased since the 2010. The domain and range will stay the same because the number of downloads could never be a negative number. There are problems with making a continuous function with these data points, next year there will be a new data point that will change the curve of the function.
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