Very simple problem regarding shifting of a signal
Don't look at graphs and don't think of "flip and slide" as your
instructor/TA will tell you is the way to solve such problems.  

$x(\cdot)$ is a function that has value $5$ whenever what
is between the "$($" and the "$)$" has value between $-4$ and $4$.  So, $x(1-t)$
has value $5$ exactly when

$$ -4 \leq 1-t \leq 4 \quad \Rightarrow \quad t \in [a, b]$$

where $a$ and $b$ are numbers (hint: they are integers!) that I will
leave for you to work as an exercise. When you are done, you can easily
sketch $x(1-t)$  from this information.