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Mathematics, 16.05.2021 02:20 graymonky12

Katrina is driving to her grandparents' house. The distance, y miles, she has left to go after driving for hours is given by f(x) = 400 – 60x. After driving for 3 hours, how many miles will Katrina have left to go? i think I have the right answer but I need someone to explain and give their answer so I know for sure I'm right​

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