Decide whether or not the given lengths could represent the sides of a triangle?

3 in., 5 in., 7 in.

Yes: 3 + 5 > 7, 3 + 7 > 5, and 5 + 7 > 3.

4 cm, 5 cm, 9 cm

No: 4 + 5 = 9. The segments would be collinear if their endpoints intersected.

5 ft, 7 ft, 14 ft

No: 5 + 7 < 14. Two endpoints of the segments would not intersect.