Which of the following graphs represents a one to one function?

What is the value of x? enter your answer in the box. photo attached.

The legs of a right triangle measure 6 meters and 8 meters. what is the length of the hypotonuse.

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.