Which of the following sets of possible side lengths forms a right triangle? 11, 60, and 61
6, 12, and 13
9, 40, and 45
12, 35, and 38

The bottom of ignacio's desktop is 74.5cm from the floor. ignacios 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.