Answer
$a.$
Starting with the graph of $f(x)$,
- reflect it about the $x$-axis ... to get $-f(x)$,
$b.$
Starting with the graph of $f(x)$,
- compress it vertically by factor $\displaystyle \frac{1}{3}$... to get$ \displaystyle \frac{1}{3}f(x)$
Work Step by Step
The exercise is to describe transformations,
so the answer is given in step-by-step form.