Answer:

Explanation:
The intervals at the right of each number indicate what values of
you can put into the function
, and what answers they give.
So for
, we look at where
fits in the intervals. It cannot be the top one, because it says that
has to be less than
for that particular value.
However, on the next interval down, it says that
is less than or equal to
, therefore
would be allowed here. Looking at the value this interval corresponds to, we see it is 0. Therefore,
.
Looking at
, it definitely will not fit in the top interval, as 4 is not mentioned there at all. Looking at the next interval down, it says
has to be less than 4, so we cannot use that. However, on the final interval, it says that 4 is less than or equal to
, therefore it is allowed here. Looking at which value this interval corresponds to, we see it is -4. Therefore,
.
Hope this helps.