What was used to enhance silent films of the early 1900s

Into what form does the barcode reader convert individual bar patterns?

If you want to delete an entire word at a time, which key should you press along with the backspace or delete key?

Along what line of action can the camera move to follow the movement of actors for screen direction? a. along a 90-degree arcb. along a 120-degree arcc. along a 180-degree arcd. along a 360-degree arc