Tom does a weekly exercise program consisting of cardiovascular work and weight training. Each week, he exercises for at least 10 hours. He spends at most 7 hours on weight training. He spends at most 12 hours doing cardiovascular work. Let x denote the time (in hours) that Tom spends doing cardiovascular work. Let y denote the time (in hours) that he spends on weight training. Shade the region corresponding to all values of x and y that satisfy these requirements. 13- 12- 11- 图 10- 8- 6- 3. 11 13

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