What consists of one endpoint and all the points on one side of the endpoint extends infinitely in one direction?

10 ! in a race, nick is 50 feet in front of jay after ten seconds. how fast can nick run, if jay can run 20 feet per second?

Askate shop rents roller skates as shown on the table below. which graph and function models this situation?

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why?