What’s the difference between a line and a line segment

A line can be named either using two points on the line (for example, ↔AB ) or simply by a letter, usually lowercase (for example, line m ). A line segment has two endpoints. It contains these endpoints and all the points of the line between them.

i got 10.28 but that rounds up to 10.3

what i would say the best answer is a. 40.5