A 150-pound person burns 5.3 calories per minute when walking at a speed of 4 miles per hour. While walking this person eats a snack that has 50 calories. This snack subtracts from the calories burned while walking. How long must this person walk at this speed to burn at least 180 calories

The bottom of ignacio's desktop is 74.5cm from the floor. ignacio's sits in his adjustable chair, and the tops of his legs are 49.3cm from the floor. each clockwise rotation of the knob on the chair raises ignacio's legs by 4.8cm. write an inequality to determine the number of clockwise rotations, r, ignacio could make with the knob without his legs touching the desk