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To measure how much gasoline she uses on her road trip , Hortense makes a graph that shows the amount remaining in the tank as a function of the miles she has driven ( see figure ) .

User Jood
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It is important to know that the domain set is formed by all the x-values shown by the graph.

Having said that, the domain of the given graph is from 0 to 400, positive real numbers.

Hence, the answer is B.

User PaulWebbster
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