David claims that it's possible to create a segment exactly 5 units in length. Build such a segment, and explain how you know the length is exactly 5 units, or explain why such a segmer is impossible.

For a read-a-thon, jay and odhràn each started reading a book at the same time and continued reading for several hours. jay's book had 278 pages, and he read 55 pages per hour. odhràn's book had 238 pages, and he read 45 pages per hour. after how many hours did they have the same number of pages left, and how many pages were left?

(hurry! ) which expression is equivalent to the following complex fraction?

Arace is 10 kilometers long.markers will be placed at the beginning and end of the race course and at each 500 meter mark.how many markers are needed to mark the course for the race?