Lena does a weekly exercise program consisting of cardiovascular work and welght training. Each week, she exercises for at least 10 hours. She spends at most 12 hours on weight training. She spends at most 4 hours doing cardiovascular work. Let x denote the time in hours) that Lena spends doing cardiovascular
work. Let y denote the time (in hours) that she spends on weight training. Shade the region corresponding to all values of x and y that satisfy these
requirements.