From 600 meters above sea level, Katie took off in her helicopter and descended 400 meters. Which integer represents Katie's elevation now?
A 1000
B 200
600
400

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.