Andy's line segment's initial length was 5.8 cm.
RESOLUTION STEPS
Andy separated the line segment into two equal segments by bisecting it using the paper folding technique. The initial length of the line segment car can be calculated by combining these two portions together if each is 2.9 cm long.
2.9 cm + 2.9 cm equals 5.8 cm
Thus, Andy's line segment's initial length was 5.8 cm.