This graph appears to follow an exponential equation. The domain of this function is x>0, and the range for this function is y>0. The graph will start to decrease after 2013. People want to stream music from their phones instead of buying albums. This affects the domain and range, because if the graph falls below zero, then the entire function would change and so would the domain and range. Yes there is a problem trying to extend a set of data points because the graph may not be accurate.
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