Please help thank you :)

Which of the following statement about pascal's triangle are true?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

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.