Juliet starts at the 10-meter mark and runs 45 meters. To find out how far she is from the beginning of the track, we add the distance she ran to her starting position.
Starting position: 10 meters
Distance run: 45 meters
Total distance from the beginning of the track:
10 meters + 45 meters = 55 meters
Therefore, after running 45 meters, Juliet is 55 meters from the beginning of the track.