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OpenStudy (anonymous):
Write a rational function that can be used to model the race, where the independent variable, r, represents the average speed in miles per hour and the dependent variable, t, represents the time in hours it takes to complete the race. How do r and t vary with each other? t = 500r; direct variation t = 500/r^2; inverse exponential variation t = 500/r; inverse variation t = 500r^2; exponential variation
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