Mary does a weekly exercise program consisting of cardiovascular work and weight training. Each week, she exercises for at least 12 hours. She spends at most 7 hours on weight training. She spends at most 10 hours doing cardiovascular work. Let denote the time (in hours) that Mary spends doing cardiovascular work. Let denote the time (in hours) that she spends on weight training. Shade the region corresponding to all values of and that satisfy these requirements.