2013 TWO(d)

The graph below shows the function $y=f(x)$.

For the function $f(x)$ above:

(i) Find all the value(s) of $x$ that meet each of the following conditions:

1. $f^{\prime }(x)=0$

2. $f^{\prime \prime }(x)<0$

3. $f(x)$ is not differentiable

(ii) What is the value of $f(-1)$?

(iii) What is the value of ${\lim }_{x\to 3}f(x)$?

State clearly if the value does not exist.