Question
Raoul's calorie expenditure c varies directly with treadmill time m in minutes. He burns 315 calories in 18 minutes. (a) Write an equation relating c and m. (b) Use that model to find the predicted calories burned in 25 minutes.
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Evidence boundary
The 25-minute value is a prediction from the stated constant-ratio model, not an independent measurement. The source uses c,m; y,x in the search phrase denotes the generic direct-variation form.