Question

is it possible to have a negative delta s?

Answer 1

Hmm, if by delta s you mean the change in distance, then it can be negative. In this sense, the sign is the indicator of direction, which is backwards.

Answer 2

i am talking about limits and stuff

Answer 3

Then say so! Your post can be interpreted in many ways.
According to the wiki, the delta is a positive number:
"The phrase "as x approaches c" then indicates that we refer to values of x whose distance from c is less than some positive number δ (the lower case Greek letter delta)"

Answer 4

okay makes sense thank you