I need help on this limit problem, we aren't given an equation....so I'm not really sure how to do these. We were supposed to have a lesson on limits but we didn't finish the lesson and our teacher let us wander off without knowing 1/2 the material

Let f(x) =

-x, x < - 1

x -2, -1 less than or equal to x < 1

1, x = 1

(x-1)^2, x>1

A) limit of f(x), as x approaches -1 from below

B) limit of f(x), as x approaches -1 from above

And also the same for 0 and 1

I also need help on simplifying these limits, they are what they look like. The problems were so that the x would approach whatever number that would make the denominator 0. And I couldn't see any way to simplify these but if anyone here can that would be great.

1) [(x/x-2) - x+2]/x-4

2) [sq. root (1 + h) + 1]/h

3) [(1/sq. root(4+h)) - 1/2]/h

4) [sq. root (x-1)]/x^2 - 1

5) [sq. root(x+1) - sq. root(2x-2)]/x-3