Answer
$\text{a) }
f(5)\approx-5.5
\\\text{b) }
x\approx3$
Work Step by Step
$\bf{\text{Solution Outline:}}$
Use the information in the given graph.
$\bf{\text{Solution Details:}}$
To estimate $
f(5)
,$ find the value of $y$ when $x=
5
.$ Based on the graph, then $
f(5)\approx-5.5
.$
To estimate $
f(x)=-4
,$ find the value of $x$ when $y=
-4
.$ Based on the graph, $
x\approx3
.$
The answers are
\begin{array}{l}\require{cancel}
\text{a) }
f(5)\approx-5.5
\\\text{b) }
x\approx3
.\end{array}