A movie company is surveying people about their favorite type of movie. Which of the following is a random sample?
A: all students who go to the movies
B: teenagers waiting on line at the movie theater
C: 100 names randomly selected from the phone book
D: people leaving a movie theater

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.