Rob brought a hat and 3 shirts for 35$. Dan brought 2 hats and a shirt for 20$. Which system of equations can be used to find s , the cost of one shirt and h , the cost of one hat

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