What is meant mathematically when we say we have an "even" or "odd" function?

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?

What’s -11-33k and factor each expression completely

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length