Let $F$ be the function below.

Evaluate each of the following expressions:

a$)\underset{x-1^{-}}{lim}F(x)=$ help $($limits$)$

b$)\underset{x-1^{}}{lim}F(x)=$

c$)\underset{2-1}{lim}F(x)=$

d$)F(-1)=$

e$)\underset{x{1}^{-}}{lim}F(x)=$

f$)\underset{x{1}^{}}{lim}F(x)=$