For

to be continuous at

, we need to have

Note that

means that

, but that

is *approaching* 5. We're told that for

, we have

We can write

and the limit would be

and so

is discontinuous.
C) Ther is one outliner , indicating an abnormally large number of books were rented out on that day
The answer is 4.5 miles. Hope it helps!