These are the only two i couldn't figure out. If someone could help, that'd be great. Here they are:

1) Limit where h approaches 0- {Square root(4 + h) - 2}/h

In words, the limit where h approaches zero of the square root of four plus h minus 2 all over h.

2) Limit where h approaches 0- 1/{square root(4 + h)} - 1/{2}/h

In words, the limit where h approaches zero of 1 divided by the square root of four plus h minus one half all over h.

Please help, need by tomorrow morning! Thanks!